Product Name

  • Name

    2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

  • EINECS
  • CAS No. 122852-75-9
  • Article Data4
  • CAS DataBase
  • Density 1.316 g/cm3
  • Solubility
  • Melting Point 234-238 °C(Solv: ethanol (64-17-5))
  • Formula C12H12N2O
  • Boiling Point 508.047 °C at 760 mmHg
  • Molecular Weight 200.24
  • Flash Point 261.057 °C
  • Transport Information
  • Appearance
  • Safety
  • Risk Codes
  • Molecular Structure Molecular Structure of 122852-75-9 (2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one)
  • Hazard Symbols
  • Synonyms 5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-1-one;
  • PSA 34.03000
  • LogP 1.79300

Synthetic route

C18H18N2O2

C18H18N2O2

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
With boron trifluoride diethyl etherate In toluene at 110℃; Inert atmosphere;94%
2,3,4,5-tetrahydro-1H-pyrido-[4,3-b]indol-1-one
122852-78-2

2,3,4,5-tetrahydro-1H-pyrido-[4,3-b]indol-1-one

methyl iodide
74-88-4

methyl iodide

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Stage #1: 2,3,4,5-tetrahydro-1H-pyrido-[4,3-b]indol-1-one With sodium hexamethyldisilazane In N,N-dimethyl-formamide at 5℃; for 0.333333h; Inert atmosphere;
Stage #2: methyl iodide In N,N-dimethyl-formamide at 5℃; for 0.333333h;		72%
2,3,4,5-tetrahydro-1H-pyrido-[4,3-b]indol-1-one
122852-78-2

2,3,4,5-tetrahydro-1H-pyrido-[4,3-b]indol-1-one

dimethyl sulfate
77-78-1

dimethyl sulfate

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
With sodium hydroxide In water; acetone
5,6-dihydro-4-(2-methyl-2-phenylhydrazino)-2(1H)-pyridinone
139122-76-2

5,6-dihydro-4-(2-methyl-2-phenylhydrazino)-2(1H)-pyridinone

sulfuric acid
7664-93-9

sulfuric acid

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
With sodium hydroxide In water
With sodium hydroxide In water; acetic acid
N-(4-(2-aminophenyl)but-3-yn-1-yl)-4-methylbenzenesulfonamide
1416349-23-9

N-(4-(2-aminophenyl)but-3-yn-1-yl)-4-methylbenzenesulfonamide

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1.1: pyridine / dichloromethane / 12 h / 0 - 20 °C / Schlenk technique; Inert atmosphere
2.1: diethylzinc / toluene; dimethyl sulfoxide / 10 h / 25 °C / 760.05 Torr / Schlenk technique
2.2: 3 h / 0 - 20 °C / Schlenk technique; Inert atmosphere
3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / Schlenk technique; Reflux
4.1: potassium carbonate / N,N-dimethyl-formamide / 2.5 h / 20 °C / Schlenk technique
5.1: sodium anthracenide / 1,2-dimethoxyethane / 1 h / -78 °C / Schlenk technique; Inert atmosphere
View Scheme
2-(4-(N-tosyl)amino-1-butynyl)-N-tosylaniline
1000205-65-1

2-(4-(N-tosyl)amino-1-butynyl)-N-tosylaniline

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1.1: diethylzinc / toluene; dimethyl sulfoxide / 10 h / 25 °C / 760.05 Torr / Schlenk technique
1.2: 3 h / 0 - 20 °C / Schlenk technique; Inert atmosphere
2.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / Schlenk technique; Reflux
3.1: potassium carbonate / N,N-dimethyl-formamide / 2.5 h / 20 °C / Schlenk technique
4.1: sodium anthracenide / 1,2-dimethoxyethane / 1 h / -78 °C / Schlenk technique; Inert atmosphere
View Scheme
2,3,4,5-tetrahydro-2,5-ditosyl-1H-pydrido[4,3-b]indole-1-one

2,3,4,5-tetrahydro-2,5-ditosyl-1H-pydrido[4,3-b]indole-1-one

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / Schlenk technique; Reflux
2: potassium carbonate / N,N-dimethyl-formamide / 2.5 h / 20 °C / Schlenk technique
3: sodium anthracenide / 1,2-dimethoxyethane / 1 h / -78 °C / Schlenk technique; Inert atmosphere
View Scheme
2,3,4,5-tetrahydro-2-tosyl-1H-pydrido[4,3-b]indole-1-one

2,3,4,5-tetrahydro-2-tosyl-1H-pydrido[4,3-b]indole-1-one

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: potassium carbonate / N,N-dimethyl-formamide / 2.5 h / 20 °C / Schlenk technique
2: sodium anthracenide / 1,2-dimethoxyethane / 1 h / -78 °C / Schlenk technique; Inert atmosphere
View Scheme
2-iodophenylamine
615-43-0

2-iodophenylamine

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 6 steps
1.1: bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; triethylamine / dimethyl sulfoxide / 16 h / 45 °C / Schlenk technique; Inert atmosphere
2.1: pyridine / dichloromethane / 12 h / 0 - 20 °C / Schlenk technique; Inert atmosphere
3.1: diethylzinc / toluene; dimethyl sulfoxide / 10 h / 25 °C / 760.05 Torr / Schlenk technique
3.2: 3 h / 0 - 20 °C / Schlenk technique; Inert atmosphere
4.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / Schlenk technique; Reflux
5.1: potassium carbonate / N,N-dimethyl-formamide / 2.5 h / 20 °C / Schlenk technique
6.1: sodium anthracenide / 1,2-dimethoxyethane / 1 h / -78 °C / Schlenk technique; Inert atmosphere
View Scheme
C19H18N2O3S

C19H18N2O3S

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
With sodium anthracenide In 1,2-dimethoxyethane at -78℃; for 1h; Schlenk technique; Inert atmosphere;4.6437 g
2-allyl-phenylamine
32704-22-6

2-allyl-phenylamine

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 7 steps
1.1: pyridine / dichloromethane / 20 °C
2.1: dichloro[2,2'-bis(diphenylphosphino)-1,1'-binaphthyl]palladium(II); silver trifluoromethanesulfonate / toluene / 12 h / 90 °C / Inert atmosphere
3.1: potassium hydroxide / ethanol / 80 °C / Schlenk technique; Inert atmosphere
4.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 0 °C / Schlenk technique; Inert atmosphere
4.2: 0 °C / Schlenk technique; Inert atmosphere
5.1: 10 wt% Pd(OH)2 on carbon; hydrogen / ethanol / 24 h / 20 °C / 3800.26 Torr / Autoclave
6.1: triethylamine / dichloromethane / 20 °C / Schlenk technique
7.1: boron trifluoride diethyl etherate / toluene / 110 °C / Inert atmosphere
View Scheme
N,N-dibenzyl-2-(1-tosyl-1H-indol-2-yl)ethan-1-amine

N,N-dibenzyl-2-(1-tosyl-1H-indol-2-yl)ethan-1-amine

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1.1: potassium hydroxide / ethanol / 80 °C / Schlenk technique; Inert atmosphere
2.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 0 °C / Schlenk technique; Inert atmosphere
2.2: 0 °C / Schlenk technique; Inert atmosphere
3.1: 10 wt% Pd(OH)2 on carbon; hydrogen / ethanol / 24 h / 20 °C / 3800.26 Torr / Autoclave
4.1: triethylamine / dichloromethane / 20 °C / Schlenk technique
5.1: boron trifluoride diethyl etherate / toluene / 110 °C / Inert atmosphere
View Scheme
N-tosyl-o-allylaniline
51315-69-6

N-tosyl-o-allylaniline

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 6 steps
1.1: dichloro[2,2'-bis(diphenylphosphino)-1,1'-binaphthyl]palladium(II); silver trifluoromethanesulfonate / toluene / 12 h / 90 °C / Inert atmosphere
2.1: potassium hydroxide / ethanol / 80 °C / Schlenk technique; Inert atmosphere
3.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 0 °C / Schlenk technique; Inert atmosphere
3.2: 0 °C / Schlenk technique; Inert atmosphere
4.1: 10 wt% Pd(OH)2 on carbon; hydrogen / ethanol / 24 h / 20 °C / 3800.26 Torr / Autoclave
5.1: triethylamine / dichloromethane / 20 °C / Schlenk technique
6.1: boron trifluoride diethyl etherate / toluene / 110 °C / Inert atmosphere
View Scheme
N,N-dibenzyl-2-(1H-indol-2-yl)ethanamine

N,N-dibenzyl-2-(1H-indol-2-yl)ethanamine

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 0 °C / Schlenk technique; Inert atmosphere
1.2: 0 °C / Schlenk technique; Inert atmosphere
2.1: 10 wt% Pd(OH)2 on carbon; hydrogen / ethanol / 24 h / 20 °C / 3800.26 Torr / Autoclave
3.1: triethylamine / dichloromethane / 20 °C / Schlenk technique
4.1: boron trifluoride diethyl etherate / toluene / 110 °C / Inert atmosphere
View Scheme
C25H26N2

C25H26N2

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: 10 wt% Pd(OH)2 on carbon; hydrogen / ethanol / 24 h / 20 °C / 3800.26 Torr / Autoclave
2: triethylamine / dichloromethane / 20 °C / Schlenk technique
3: boron trifluoride diethyl etherate / toluene / 110 °C / Inert atmosphere
View Scheme
2-(1-methyl-indol-2-yl)-ethylamine
7088-88-2

2-(1-methyl-indol-2-yl)-ethylamine

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: triethylamine / dichloromethane / 20 °C / Schlenk technique
2: boron trifluoride diethyl etherate / toluene / 110 °C / Inert atmosphere
View Scheme
<5-13C>methyl-(3H-imidazol-<4-13C>yl)-methanol

<5-13C>methyl-(3H-imidazol-<4-13C>yl)-methanol

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

2,3,4,5-tetrahydro-5-methyl-2-<(<5-13C>methyl-1H-imidazol-<4-13C>yl)methyl>-1H-pyrido<4,3-b>indol-1-one

2,3,4,5-tetrahydro-5-methyl-2-<(<5-13C>methyl-1H-imidazol-<4-13C>yl)methyl>-1H-pyrido<4,3-b>indol-1-one

Conditions
ConditionsYield
With methanesulfonic acid In various solvent(s) at 135℃; for 4h;74%
N3-BOC-5-(hydroxymethyl)-4-methylimidazole
550340-81-3

N3-BOC-5-(hydroxymethyl)-4-methylimidazole

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

alosetron
122852-42-0

alosetron

Conditions
ConditionsYield
Stage #1: N3-BOC-5-(hydroxymethyl)-4-methylimidazole; 2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one With trifluoroacetic acid In N,N-dimethyl-formamide at 100 - 115℃;
Stage #2: With potassium carbonate In water pH=6.8 - 7; Product distribution / selectivity;		65%
2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

5-methyl-(3H-imidazol-4-yl)-<2H2>methanol

5-methyl-(3H-imidazol-4-yl)-<2H2>methanol

5-methyl-2-(5-methyl-1H-imidazol-4-yl-<2H2>methyl)-2,3,4,5-tetrahydro-pyrido<4,3-b>indol-1-one

5-methyl-2-(5-methyl-1H-imidazol-4-yl-<2H2>methyl)-2,3,4,5-tetrahydro-pyrido<4,3-b>indol-1-one

Conditions
ConditionsYield
With methanesulfonic acid In various solvent(s) at 135℃; for 4h;62%
2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

4(5)-methyl-5(4)-hydroxymethylimidazole
29636-87-1

4(5)-methyl-5(4)-hydroxymethylimidazole

alosetron
122852-42-0

alosetron

Conditions
ConditionsYield
With methanesulfonic acid In 1-methyl-pyrrolidin-2-one at 20 - 135℃; for 21h; Schlenk technique; Inert atmosphere;58%
2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

(<5-13C2H3>methyl-3H-imidazol-4-yl)-methanol

(<5-13C2H3>methyl-3H-imidazol-4-yl)-methanol

5-methyl-2-(<<5-13C2H3>methyl-1H-imidazol-4-yl>methyl)-2,3,4,5-tetrahydropyrido<4,3-b>indol-1-one

5-methyl-2-(<<5-13C2H3>methyl-1H-imidazol-4-yl>methyl)-2,3,4,5-tetrahydropyrido<4,3-b>indol-1-one

Conditions
ConditionsYield
With methanesulfonic acid In various solvent(s) at 135℃; for 4h;52%
4-hydroxymethyl-5-methylimidazole hydrochloride
38585-62-5

4-hydroxymethyl-5-methylimidazole hydrochloride

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

alosetron
122852-42-0

alosetron

Conditions
ConditionsYield
In 1-methyl-pyrrolidin-2-one at 140℃; for 4h; Inert atmosphere;29%
maleic acid
110-16-7

maleic acid

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

2,3,4,5-Tetrahydro-5-methyl-2-[(5-methyl-1H-imidazol-4-yl)methyl]-6-(phenylmethoxy)-1H-pyrido[4,3-b]indol-1-one maleate
128486-73-7

2,3,4,5-Tetrahydro-5-methyl-2-[(5-methyl-1H-imidazol-4-yl)methyl]-6-(phenylmethoxy)-1H-pyrido[4,3-b]indol-1-one maleate

4-hydroxymethyl-5-methylimidazole hydrochloride
38585-62-5

4-hydroxymethyl-5-methylimidazole hydrochloride

sodium hydrogencarbonate
144-55-8

sodium hydrogencarbonate

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

alosetron
122852-42-0

alosetron

Conditions
ConditionsYield
With p-toluenesulfonic acid monohydrate In 1-methyl-pyrrolidin-2-one; ethanol; dichloromethane
In 1-methyl-pyrrolidin-2-one; ethanol; dichloromethane
...Expand
4-chloromethyl-5-methyl-1-tritylimidazole
106147-85-7

4-chloromethyl-5-methyl-1-tritylimidazole

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

alosetron
122852-42-0

alosetron

Conditions
ConditionsYield
With hydrogenchloride In 1,2-dimethoxyethane; water
With hydrogenchloride In 1,2-dimethoxyethane; water
With hydrogenchloride In 1,2-dimethoxyethane; water
1-(chloromethyl)-2-methyl-1H-imidazole hydrochloride

1-(chloromethyl)-2-methyl-1H-imidazole hydrochloride

maleic acid
110-16-7

maleic acid

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

2,3,4,5-Tetrahydro-5-methyl-2-[(2-methyl-1H-imidazol-1yl)methyl]-1H-pyrido[4,3-b]indol-1-one maleate
126770-17-0

2,3,4,5-Tetrahydro-5-methyl-2-[(2-methyl-1H-imidazol-1yl)methyl]-1H-pyrido[4,3-b]indol-1-one maleate

Conditions
ConditionsYield
In ethanol; N,N-dimethyl-formamide
...Expand
N3-BOC-5-(hydroxymethyl)-4-methylimidazole
550340-81-3

N3-BOC-5-(hydroxymethyl)-4-methylimidazole

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one
122852-75-9

2,3,4,5-tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one

2,3,4,5-tetrahydro-5-methyl-2-[(5-methyl-1H-imidazol-4-yl)methyl]-1H-pyrido[4,3-b]indol-1-one hydrochloride

2,3,4,5-tetrahydro-5-methyl-2-[(5-methyl-1H-imidazol-4-yl)methyl]-1H-pyrido[4,3-b]indol-1-one hydrochloride

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1.1: trifluoroacetic acid / N,N-dimethyl-formamide / 100 - 115 °C
1.2: pH 6.8 - 7
2.1: hydrogenchloride / isopropyl alcohol; methanol / 40 - 45 °C
View Scheme

2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one Chemical Properties

Following is the structure of 2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one (CAS NO.122852-75-9):
                       
Empirical Formula: C12H12N2O
Molecular Weight: 200.2365 g/mol
Molar Refractivity: 57.876 cm3
Molar Volume: 152.137 cm3
Density: 1.316 g/cm3
Flash Point: 261.057 °C
Index of Refraction: 1.686
Surface Tension: 50.375 dyne/cm
Enthalpy of Vaporization of 2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one (CAS NO.122852-75-9): 77.828 kJ/mol
Boiling Point of 2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one (CAS NO.122852-75-9): 508.047 °C at 760 mmHg
SMILES: O=C3NCCc2c3c1c(cccc1)n2C
InChI: InChI=1/C12H12N2O/c1-14-9-5-3-2-4-8(9)11-10(14)6-7-13-12(11)15/h2-5H,6-7H2,1H3,(H,13,15)
InChIKey: GLHMAFAXJJECMG-UHFFFAOYAH

2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one Specification

 2,3,4,5-Tetrahydro-5-methyl-1H-pyrido[4,3-b]indol-1-one , its cas register number is 122852-75-9. It also can be called 1H-pyrido[4,3-b]indol-1-one, 2,3,4,5-tetrahydro-5-methyl- ; 5-Methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-1-one .

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