Best Seller, High Quality, Competitive Price, Fast Delivery, Quick ResponseAppearance:powder, or liquid Storage:Stored in room temperature, ventilated place Package:Bottle, barrel, cargo, container, etc. Application:Pharmaceuticals, intermediates, AP
Dayangchem's R&D center can offer custom synthesis according to the contract research and development services for the fine chemicals, pharmaceutical, biotechnique and some of the other chemicals. DayangChem can provide different quantities
Cas:58-27-5
Min.Order:1 Kilogram
FOB Price: $3.0
Type:Lab/Research institutions
inquiryThe melting point of 105-108 ° C Solubility in water INSOLUBLE Feed additive raw material mainly promotes the synthesis of coagulase in animal liver and promotes the synthesis of plasma coagulation factor in liver. ---------------------
Cas:58-27-5
Min.Order:1 Kilogram
FOB Price: $110.0 / 160.0
Type:Manufacturers
inquiryWelcome to Simagchem, your partner in China as a premier supply of bulk specialty chemicals for industry and life science. We introduce experienced quality product and exceptional JIT service with instant market intelligence in China to benefit our
Cas:58-27-5
Min.Order:25 Kilogram
Negotiable
Type:Manufacturers
inquiryHebei yanxi chemical co., LTD is a professional research, development and production 2-phenylacetamide enterprise backbone members by local well-known entrepreneurs and professional senior engineers in the party's "low carbon environ
1. Guaranteed purity; 2. Large quantity in stock; 3. Largest manufacturer; 4. Best service after shipment with email; 5. High quality & competitive price; ...... Appearance:Yellow Crystals Storage:Store at RT Package:1kg/foil bag; 1kg
Cas:58-27-5
Min.Order:10 Kilogram
FOB Price: $300.0
Type:Trading Company
inquiryXi’an Quanao Biotech Co., Ltd. with 18 years experience in plant extract filed. Product grade: Medicine, Health care product, Cosmetics, Food, Beverage, Feed. Hot selling market: Europe, North America, South America, Middle East, Asia Pacifi
Cas:58-27-5
Min.Order:1 Kilogram
FOB Price: $8.0 / 19.0
Type:Manufacturers
inquiry1, Full experience of large numbers containers loading in main Chinese seaports 2, Packing with pallet as buyer's special request 3, Best service after shipment with e-mail 4, Cargoes together with container sales service available
Cas:58-27-5
Min.Order:25 Kilogram
Negotiable
Type:Trading Company
inquiryThe above product is Ality Chemical's strong item with best price, good quality and fast supply. Ality Chemical has been focusing on the research and production of this field for over 14 years. At the same time, we are always committed to providi
At present, the main application is as feed additives, fungicides, and pharmaceutical intermediates Appearance:Bright yellow crystalline powder Storage:Store in a cool, dry, well ventilated warehouse. Package:25kg cardboard drum Application:At pres
Cas:58-27-5
Min.Order:1 Metric Ton
Negotiable
Type:Manufacturers
inquiryCAS No.: 58-27-5 Other Names: Vitamin k3 Menadione sodium bisulfite MF: C11H8O2 EINECS No.: N/A Place of Origin: China (Mainland) Type: Antibiotic and Antimi
Cas:58-27-5
Min.Order:1 Kilogram
FOB Price: $260.0 / 300.0
Type:Other
inquiryProduct name:Vitamin K3(2-Methyl-1,4-naphthoquinone ) MF: C11H8O2 1.We have been specializing in special fine chemical for long, with strong R&D strength. 2.ISO9001. 3.We have been cooperating with oversea from Europe, USA, Korea, Japan
1. Factory price and high quality must be guaranteed, base on 8 years of production and R&D experience2. Free samples will be provided,ensure specifications and quality are right for customer3. Customers will receive the most professional technical s
Cas:58-27-5
Min.Order:1 Gram
FOB Price: $0.1
Type:Manufacturers
inquiryADVANTAGE: 1. More than 3,000 Chinese medicine reference substances / standard products available from stock, issued on the same day, multiple cities can be delivered the next day 2. The products are provided with COA, HPLC, NMR, quality assurance,
Colorcom is a global leader in industrial chemical manufacturing and is continuously innovating and transforming to exceed client expectations and industry standards. Colorcom prides itself on superior customer and technical focus, while focusing on
Our main production base is located in Xuzhou industry park. We are certified both to the ISO 9001 and ISO 14001 Standards, have a safety management system in place.Our R&D team masters core technology for process-design of target building block
Our advantages: 1. All inquiries will be replied within 12 hours. 2. Dedication to quality, supply & service. 3. Strictly on selecting raw materials. 4. Reasonable & competitive price, fast lead time. 5. Sample is available for your eva
Our company was built in 2009 with an ISO certificate.In the past 5 years, we have grown up as a famous fine chemicals supplier in China and we had established stable business relationships with Samsung,LG,Merck,Thermo Fisher Scientific and so on.
Cas:58-27-5
Min.Order:1 Kilogram
Negotiable
Type:Lab/Research institutions
inquiryWITH US,YOUR MONEY IN SAFE,YOUR BUSINESS IN SAFE 1)Quick Response Within 12 hours; 2)Quality Guarantee: All products are strictly tested by our QC, confirmed by QA and approved by third party lab in China, USA, Canada, Germany, UK, Italy, France et
Cas:58-27-5
Min.Order:1 Kilogram
FOB Price: $139.0 / 210.0
Type:Trading Company
inquiryProduct Name Vitamin K3(Menadione) CAS 58-27-5 Color White powder Specification 98% Appearance:White powder Storage:Store in cool an
1)quick response within 12 hours; 2)quality guarantee: all products are strictly tested by our qc, confirmed by qa and approved by third party lab in china, usa, canada, germany, uk, italy, france etc. 3) oem/odm available; 4) rea
Cas:58-27-5
Min.Order:1 Gram
FOB Price: $2.0
Type:Lab/Research institutions
inquiryOur Adwantage: 1.We have stock so we can delivery quickly at the very day when receive the payment. 2.Best price, first class service, high successful delivery rate. A discount would be given when you make a large order. 3.High quality gua
Cas:58-27-5
Min.Order:2 Gram
Negotiable
Type:Other
inquiry1,In No Less five years exporting experience. 2.Lower Price with higher quality 3,Free sample 4,We are sincerely responsible for the "product quality" and "After Service" Onchem specialized in APIs, chemical intermediate
Cas:58-27-5
Min.Order:1 Kilogram
Negotiable
Type:Lab/Research institutions
inquiry1.Prompt Goods; 2.Flexible payment terms; 3.Documents & Certificate support. Name: :Menadione Structure: Formula: C11H8O2Molecular Weight : 172.18 Synonyms: enadione (1.05793);weishengsK3;Phytomenadione EP Impurity A;MenadioneForBiochemis
We are the manufacturers and suppliers of API in China, and warehouse in Germany and USA of California, which can quickly and safely deliver to your address 1.High quality and competitive price. 2.Free sample for your evaluation. 3.Promptly delivery
Cas:58-27-5
Min.Order:10 Gram
FOB Price: $3.5
Type:Trading Company
inquiryOur company has been in existence for 10 years since its establishment. We have our own unique team. The company integrates independent research and development, production and sales. We have established famous brands at home and abroad. At prese
Menadione CAS: 58-27-5 Qingdao Belugas Import and Export Co., Ltd. is a scientific and technological company integrating research and development, production and trade of chemical intermediates, specializing in high quality organic intermediates, st
Cas:58-27-5
Min.Order:1 Gram
Negotiable
Type:Lab/Research institutions
inquiryHello, dear friend! I'm Hansen and Allen from China. Welcome to my lookchem mall! The following is a brief introduction of our company's products and services. If you are interested in our products, please contact us by emai
Cas:58-27-5
Min.Order:1 Kilogram
Negotiable
Type:Lab/Research institutions
inquiryFDA/FAMI-QS/HALAL Appearance:yellowish crystalline powder Package:as client requirement Application:Precursor to verious types of Vitamin K. Used as a micronutrient for livestock and pet foods. Transportation:Express, Air ,Sea Port:Any port of Chin
1.High Quality: Quality is life. Quality is the most important element for all goods. We have a lab doing research in Wuhan China and produce sarms in bulk quantity. We have 8 years experience making all kinds of sarms. And all our old customers
Cas:58-27-5
Min.Order:100 Gram
Negotiable
Type:Lab/Research institutions
inquiryConditions | Yield |
---|---|
With iodate form of Amberlyst A26 In dichloromethane at 20℃; for 2h; further reagent; | 100% |
With sulfuric acid; sodium bromide In dichloromethane; water at 15℃; for 2.98h; Electrolysis; | 99% |
With carbon dioxide; oxygen In water at 35 - 60℃; under 57005.7 - 62256.2 Torr; for 0.0833333h; Autoclave; | 96% |
Conditions | Yield |
---|---|
With Co(salN-Medpt); oxygen In acetonitrile for 0.5h; | 100% |
Stage #1: 2-methylnaphthalen-1-ol In acetonitrile at 74.84℃; Stage #2: With dihydrogen peroxide In acetonitrile for 0.75h; Reflux; chemoselective reaction; | 97.3% |
With sulfuric acid; dihydrogen peroxide In water at 36 - 40℃; for 6h; Temperature; Solvent; Green chemistry; | 94.7% |
Conditions | Yield |
---|---|
With dihydrogen peroxide; acetic acid In water at 75℃; for 5h; Product distribution / selectivity; | 100% |
With C69H63Cl6N3O9(3-)*1.5Cu(2+); acetic acid In water at 40 - 100℃; for 14h; Catalytic behavior; Reagent/catalyst; Temperature; Concentration; | 93% |
With dihydrogen peroxide; acetic acid In acetonitrile Catalytic behavior; Solvent; Reflux; | 93% |
menadione
Conditions | Yield |
---|---|
With palladium 10% on activated carbon In acetone for 24h; Reflux; Inert atmosphere; | 100% |
With sodium dichromate; sulfuric acid; acetic acid a) 80-90 deg C, 1 h, b) RT, 12 h; | 93% |
With manganese(II) bromide; copper(I) bromide In dimethyl sulfoxide at 85℃; under 600.06 Torr; for 26h; Temperature; | 91.3% |
C11H10O2
menadione
Conditions | Yield |
---|---|
With palladium 10% on activated carbon In acetone Reflux; | 100% |
Conditions | Yield |
---|---|
With sodium hydroxide In chloroform; water at 20℃; Product distribution / selectivity; | 100% |
With water; sodium carbonate at 25℃; for 120h; Time; |
Conditions | Yield |
---|---|
With carbon dioxide; oxygen In water at 37 - 80℃; under 60756.1 - 69757 Torr; for 0.125h; Pressure; Temperature; Autoclave; | 98.4% |
With lithium perchlorate In acetonitrile; tert-butyl alcohol at 16 - 18℃; for 8.6h; electrolysis on Pt electrodes; | 94% |
With chromium(VI) oxide; acetic acid at 20℃; |
2-methyl-5,6,7,8-tetrahydronaphthalene-1,4-diol
menadione
Conditions | Yield |
---|---|
With carbon dioxide; oxygen In water at 37 - 80℃; under 58505.9 - 72007.2 Torr; for 0.111111h; Autoclave; | 95.7% |
1,4-dimethoxy-2-methylnaphthalene
menadione
Conditions | Yield |
---|---|
With ammonium cerium(IV) nitrate In acetonitrile at 20℃; for 0.166667h; Oxidation; Demethylation; | 94% |
With bis-[(trifluoroacetoxy)iodo]benzene In methanol; water at 20℃; for 0.5h; | 92% |
With tert.-butylhydroperoxide; poly(bis-1,2-phenylene) diselenide In tert-butyl alcohol at 80℃; for 12h; | 90% |
With ammonium persulfate; silver nitrate In water; acetonitrile for 18h; Ambient temperature; | 56% |
Conditions | Yield |
---|---|
Stage #1: phthalic acid dimethyl ester; tert-butyl 3-cyanobutanoate With potassium tert-butylate In toluene at 100 - 105℃; for 3h; Green chemistry; Stage #2: With sodium hydroxide In water; toluene at 20 - 30℃; for 3h; Green chemistry; Stage #3: With hydrogenchloride In water; toluene at 60℃; for 3h; pH=2 - 2.5; Green chemistry; | 92.3% |
Conditions | Yield |
---|---|
92% |
Conditions | Yield |
---|---|
Stage #1: phthalic acid di(tert-butyl)ester; tert-butyl 3-cyanobutanoate With potassium tert-butylate In toluene at 100 - 105℃; for 3h; Green chemistry; Stage #2: With sodium hydroxide In water; toluene at 20 - 30℃; for 3h; Green chemistry; Stage #3: With hydrogenchloride In water; toluene at 60℃; for 3h; pH=2 - 2.5; Green chemistry; | 91.9% |
Conditions | Yield |
---|---|
Stage #1: phthalic acid di(tert-butyl)ester; C8H13NO2 With potassium tert-butylate In 5,5-dimethyl-1,3-cyclohexadiene at 100 - 105℃; for 3h; Green chemistry; Stage #2: With sodium hydroxide In 5,5-dimethyl-1,3-cyclohexadiene; water at 20 - 30℃; for 3h; Green chemistry; Stage #3: With hydrogenchloride In 5,5-dimethyl-1,3-cyclohexadiene; water at 60℃; for 3h; pH=2 - 2.5; Green chemistry; | 91.9% |
Conditions | Yield |
---|---|
Stage #1: phthalic acid dimethyl ester; methyl 3-cyanobutanoate With sodium methylate In methanol; toluene at 90 - 100℃; for 3h; Green chemistry; Stage #2: With sodium hydroxide In water; toluene at 20 - 30℃; for 3h; Green chemistry; Stage #3: With hydrogenchloride In water; toluene at 60℃; for 3h; pH=2 - 2.5; Green chemistry; | 90.7% |
2-methyl-5,8-dihydro-1,4-naphthoquinone
menadione
Conditions | Yield |
---|---|
With lithium perchlorate In acetonitrile at 16 - 17℃; for 3.2h; electrolysis on Pt electrodes; | 90% |
Conditions | Yield |
---|---|
In tert-butyl alcohol for 12h; Methylation; UV-irradiation; | 90% |
Conditions | Yield |
---|---|
Stage #1: rac-ethyl 3-cyanobutanoate; phthalic acid dimethyl ester With sodium ethanolate In methanol; toluene at 90 - 100℃; for 3h; Green chemistry; Stage #2: With sodium hydroxide In water; toluene at 20 - 30℃; for 3h; Green chemistry; Stage #3: With hydrogenchloride In water; toluene at 60℃; for 3h; pH=2 - 2.5; Green chemistry; | 89% |
Conditions | Yield |
---|---|
Stage #1: phthalic acid dimethyl ester; C8H13NO2 With sodium methylate In methanol; chlorobenzene at 90 - 100℃; for 3h; Green chemistry; Stage #2: With sodium hydroxide In water; chlorobenzene at 20 - 30℃; for 3h; Green chemistry; Stage #3: With hydrogenchloride In water; chlorobenzene at 60℃; for 3h; pH=2 - 2.5; Green chemistry; | 88.3% |
2-methylnaphthalen-1-ol
lead(IV) tetraacetate
A
menadione
B
2-acetoxy-2-methylnaphthalen-1(2H)-one
Conditions | Yield |
---|---|
In benzene Ambient temperature; | A 3% B 88% |
Conditions | Yield |
---|---|
Stage #1: Diethyl phthalate; methyl 3-cyanobutanoate With sodium ethanolate In methanol; toluene at 90 - 100℃; for 3h; Green chemistry; Stage #2: With sodium hydroxide In water; toluene at 20 - 30℃; for 3h; Green chemistry; Stage #3: With hydrogenchloride In water; toluene at 60℃; for 3h; pH=2 - 2.5; Green chemistry; | 87.8% |
Conditions | Yield |
---|---|
With oxygen In dimethyl sulfoxide at 55℃; for 24h; pH=4.5; Reagent/catalyst; Enzymatic reaction; | 85.8% |
menadione
Conditions | Yield |
---|---|
With pyridinium chlorochromate In dichloromethane at 20℃; for 5h; | 81% |
Conditions | Yield |
---|---|
With sulfuric acid; dihydrogen peroxide; acetic anhydride; acetic acid at 60℃; for 6.33333h; Product distribution / selectivity; | A n/a B 80% |
With perchloric acid; dihydrogen peroxide; acetic anhydride; acetic acid at 60℃; for 6.33333h; Product distribution / selectivity; | A n/a B 80% |
With phosphoric acid; dihydrogen peroxide; acetic anhydride; acetic acid at 60℃; for 6.33333h; Product distribution / selectivity; | A n/a B 75% |
2-Hydroxy-1,4-naphthoquinone
dimethyl sulfoxide
A
menadione
B
2,3-dimethyl-5-hydroxy-1,4-naphthoquinone
Conditions | Yield |
---|---|
With copper(II) sulfate at 50℃; for 2h; | A 60% B 80% |
1-acetoxybuta-1,3-diene
2-methylbenzene-1,4-diol
menadione
Conditions | Yield |
---|---|
With laccase In acetate buffer at 55℃; for 24h; pH=4.5; Diels-Alder reaction; | 75% |
2-methylnaphthalen-1-ol
A
menadione
B
2-acetoxy-2-methylnaphthalen-1(2H)-one
Conditions | Yield |
---|---|
With lead(IV) acetate In acetonitrile Ambient temperature; | A 16% B 74% |
Conditions | Yield |
---|---|
With dihydrogen peroxide; methyltrioxorhenium(VII) In acetic acid at 20℃; for 2h; | A 6% B 74% |
3-methylnaphthalen-1-ol
menadione
Conditions | Yield |
---|---|
With salcomine; oxygen In N,N-dimethyl-formamide for 3h; Ambient temperature; | 70% |
With salcomine; oxygen In N,N-dimethyl-formamide for 3h; | 64% |
A
menadione
B
3,3′-dimethyl-1,1′-binaphthalenyl-4,4′-diol
Conditions | Yield |
---|---|
With Jones reagent (excess) In acetone at 0℃; | A n/a B 68% |
3-oxo-1,3-dihydroisobenzofuran-1-carbonitrile
methacrylic acid methyl ester
menadione
Conditions | Yield |
---|---|
Stage #1: 3-oxo-1,3-dihydroisobenzofuran-1-carbonitrile With lithium tert-butoxide In tetrahydrofuran at -78 - -60℃; for 0.416667h; Inert atmosphere; Stage #2: methacrylic acid methyl ester In tetrahydrofuran at -78 - 20℃; Inert atmosphere; | 64% |
menadione
2,3-epoxy-2-methyl-2,3-dihydro-1,4-naphthoquinone
Conditions | Yield |
---|---|
With dihydrogen peroxide; β‐cyclodextrin In water at 25℃; for 96h; pH 9; other reagents (t-BuOOH, NaOCl, PhC(CH3)2OOH), MCPBA), other solvents (DMF, DMSO), addition of base (NaOH, NaHCO3, Na2CO3); | 100% |
With dihydrogen peroxide; β‐cyclodextrin; alpha cyclodextrin In water at 25℃; for 96h; Product distribution; pH 9; other oxidizing agents (t-BuOOH, NaOCl, PhC(CH3)2OOH), MCPBA); other solvents (DMF, DMSO), addition of base (NaOH, Na2CO3, NaHCO3); enantioselectivity (up to 40percent ee by NMR); same reaction with further naphthoquinones; | 100% |
With lithium hydroxide; tetrabutylammomium bromide; dihydrogen peroxide In toluene at 15 - 25℃; for 0.416667h; Epoxidation; ultrasonic irradiation; | 100% |
Conditions | Yield |
---|---|
With sodium dithionite In diethyl ether; water | 100% |
With sodium dithionite In diethyl ether; water at 20℃; | 100% |
With sodium dithionite In diethyl ether; water | 100% |
Isopropenyl acetate
menadione
Acetic acid (1S,2aR,8aR)-1,8a-dimethyl-3,8-dioxo-1,2,2a,3,8,8a-hexahydro-cyclobuta[b]naphthalen-1-yl ester
Conditions | Yield |
---|---|
In benzene for 1h; Irradiation; | 100% |
menadione
2,3-dihydro-2-methyl-2-(3-methyl-but-2-enyl)-1,4-naphthoquinone
Conditions | Yield |
---|---|
In N,N-dimethyl-formamide at -23℃; for 3h; | 100% |
Conditions | Yield |
---|---|
In tetrahydrofuran (Ar); stirring (1 h, -78°C); soln. filtn. off, drying (vac.); elem. anal.; | 100% |
Conditions | Yield |
---|---|
With dibenzoyl peroxide In acetic acid for 4h; Heating; | 99% |
menadione
N'-(3-methyl-4-oxo-1,4-dihydronaphthalen-1-ylidene)-1-(4-bromophenyl)-5-oxopyrrolidine-3-carbohydrazide
Conditions | Yield |
---|---|
With hydrogenchloride In water; isopropyl alcohol for 19h; Reflux; | 99% |
Conditions | Yield |
---|---|
With tetradecafluorohexane; lithium perfluorooctane sulfonate In water at 25℃; for 72h; Diels-Alder reaction; | 98% |
Conditions | Yield |
---|---|
With dibenzoyl peroxide In acetic acid for 4h; Heating; | 98% |
menadione
Conditions | Yield |
---|---|
With tert.-butylhydroperoxide; C49H63Cl6N7O2*ClH; potassium hydroxide In tert-butyl methyl ether; water at 0℃; for 0.5h; enantioselective reaction; | 98% |
With sodium hypochlorite; diphenylether; Cinchona alkaloid phase-transfer catalyst In chlorobenzene at -10℃; |
C12H15N3O2
menadione
N'-(3-methyl-4-oxo-1,4-dihydronaphthalen-1-ylidene)-1-(3-methylphenyl)-5-oxopyrrolidine-3-carbohydrazide
Conditions | Yield |
---|---|
With hydrogenchloride In water; isopropyl alcohol for 19h; Reflux; | 98% |
menadione
1,3-dihydro-imidazole-2-thione
2-(1H-imidazole-2-ylthio)-3-methylnaphthalene-1,4-dione
Conditions | Yield |
---|---|
In methanol at 20℃; for 8h; | 98% |
Conditions | Yield |
---|---|
With (2S)-2-{diphenyl[(trimethylsilyl)oxy]methyl}pyrrolidine; benzoic acid In chloroform at 20℃; for 20h; | 98% |
Conditions | Yield |
---|---|
Stage #1: menadione With palladium on activated charcoal; hydrogen In methanol for 6h; Stage #2: dimethyl sulfate With sodium methylate In methanol at 50℃; for 0.333333h; Inert atmosphere; | 97.1% |
Stage #1: menadione With hydrogenchloride; tin(ll) chloride In ethanol at 20℃; for 0.5h; Stage #2: dimethyl sulfate With potassium hydroxide In ethanol; acetone at 60℃; for 2h; | 73% |
Stage #1: menadione With hydrogenchloride; tin(ll) chloride In ethanol at 20℃; Stage #2: dimethyl sulfate With potassium hydroxide In acetone at 60℃; | |
Stage #1: menadione With hydrogenchloride; tin(ll) chloride In ethanol at 40℃; for 0.166667h; Stage #2: dimethyl sulfate With potassium hydroxide In acetone at 20℃; for 2.5h; Further stages.; | |
Stage #1: menadione With sodium dithionite In ethyl acetate at 20℃; for 0.5h; Stage #2: dimethyl sulfate With sodium methylate In isopropyl alcohol at 63℃; for 0.5h; |
menadione
Conditions | Yield |
---|---|
2,4,6-tri(4-pyridyl)-1,3,5-triazine In water-d2 at 20℃; for 3h; Irradiation; | 96% |
menadione
N'-(3-methyl-4-oxo-1,4-dihydronaphthalen-1-ylidene)-1-(4-chlorophenyl)-5-oxopyrrolidine-3-carbohydrazide
Conditions | Yield |
---|---|
With hydrogenchloride In water; isopropyl alcohol for 19h; Reflux; | 96% |
menadione
Conditions | Yield |
---|---|
With (1,2-dimethoxyethane)dichloronickel(II); bathophenanthroline In acetonitrile at 100℃; for 6h; Sealed tube; Inert atmosphere; | 96% |
Conditions | Yield |
---|---|
With aluminum oxide; bromine for 2h; Ambient temperature; other reagents: iodine monobromide, acetic acid; | 95% |
With N-chloro-succinimide; copper(II) chloride monohydrate In acetonitrile at 82℃; for 4h; regioselective reaction; | 95.9% |
Stage #1: menadione With bromine In dichloromethane at 25℃; for 1h; Stage #2: With pyridine In dichloromethane at 25℃; for 12h; | 93% |
Conditions | Yield |
---|---|
With hydrogenchloride; acetic acid at 20℃; | 95% |
With hydrogenchloride; acetic acid | 87% |
With hydrogenchloride In water; acetic acid at 60 - 65℃; for 0.5h; | 86% |
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