 
- 
                        Butanoic acid, 4-[bis(2-hydroxyethyl)amino]-2-butynyl esterCAS:62787-72-8Formula:C12H21NO4 
                     
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                        1,2-Pyrrolidinediacetic acid, diethyl esterCAS:63071-26-1Formula:C12H21NO4 
                     
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                        2-Pentenoic acid, 2-[[(1,1-dimethylethoxy)carbonyl]amino]-4-methyl-,
methyl esterCAS:63096-25-3Formula:C12H21NO4 
                     
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                        2-Propenoic acid, 2-methyl-, 2-[2-[2-(1-aziridinyl)ethoxy]ethoxy]ethyl
esterCAS:63120-82-1Formula:C12H21NO4 
                     
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                        BOC-1,2-CIS-ACHC-OHCAS:63216-49-9Formula:C12H21NO4 
                     
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                        Propanedioic acid, [2-methyl-2-[(1-methylethyl)amino]propylidene]-,
dimethyl esterCAS:63646-62-8Formula:C12H21NO4 
                     
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                        β-Ethoxy-4-morpholine-2-butenoic acid ethyl esterCAS:63868-56-4Formula:C12H21NO4 
                     
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                        2-Piperidinecarboxylic acid, 5-(acetyloxy)-6-propyl-, methyl ester,
(2S,5R,6S)-CAS:824943-49-9Formula:C12H21NO4 
                     
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                        2-Pentenoic acid, 2-[[(1,1-dimethylethoxy)carbonyl]amino]-4-methyl-,
methyl ester, (Z)-CAS:82527-32-0Formula:C12H21NO4 
                     
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                        2-Pentenoic acid, 2-[[(1,1-dimethylethoxy)carbonyl]amino]-4-methyl-,
methyl ester, (E)-CAS:82527-33-1Formula:C12H21NO4