Impurity-1

CAS No: 82834-12-6
Chemical Name:
((S)-1-Ethoxy-1-oxopentan-2-yl)-L-alanine
Molecular Formula:
C10H19NO4

Impurity-2

CAS No: 145682-38-8
Chemical Name:
(R)-2-(((R)-1-Carboxyethyl)amino)pentanoic acid
Molecular Formula:
C8H15NO4

Impurity-3

CAS No: NA
Chemical Name:
((S)-1-ethoxy-1-oxopentan-2-yl)-D-alanine
Molecular Formula:
C8H15NO4

Impurity-4

CAS No: NA
Chemical Name:
((R)-1-Ethoxy-1-oxopentan-2-yl)-L-alanine
Molecular Formula:
C8H15NO4

EP impurity L

CAS No: 111836-22-7 
Chemical Name:
(2S,3aS,7aS)-1-acetyloctahydro-1H-indole-2-carboxylic acid
Molecular Formula:
C11H17NO3

EP impurity M

CAS No: NA
Chemical Name:
(2S,3aS,7aS)-1-[(2S)-2-[[(1S)-1-(methoxycarbonyl)butyl]amino]propanoyl]octahydro-1H-indole-2- carboxylic acid
Molecular Formula:
C18H30N2O5

EP impurity N

CAS No: NA
Chemical Name:
(2S)-3-cyclohexyl-2-[[(2S)-2-[[(1S)-1-(ethoxycarbonyl)butyl]amino]propanoyl]amino]propanoic acid
Molecular Formula:
C19H34N2O5

EP impurity O

CAS No: NA
Chemical Name:
(2S,3aS,7aS)-1-[[(2S,3aS,7aS)-1-[(2S)-2-[[(1S)-1-(ethoxycarbonyl)butyl]amino]propanoyl]octahydro-1H-indol-2-yl]carbonyl]octahydro-1H-indole-2-carboxylic acid
Molecular Formula:
C28H45N3O6

EP impurity P

CAS No: 82978-68-5 
Chemical Name:
(2S,3aS,7aS)-1-((R)-2-((S)-1-ethoxy-1-oxopentan-2-ylamino)propanoyl)octahydro-1H-indole-2-carboxylic acid
Molecular Formula:
C19H32N2O5

EP impurity G

CAS No: 353777-66-9
Chemical Name:
(2S,3aS,7aS)-1-[(2S)-2-[(5RS)-3-cyclohexyl-2,4-dioxo-5-propylimidazolidin-1-yl]propanoyl]octahydro-1H-indole-2-carboxylic acid
Molecular Formula:
C24H37N3O5

EP impurity J

CAS No: NA
Chemical Name:
(2S,3aS,7aS)-1-[(2S)-2-aminopropanoyl]octahydro-1H-indole-2-carboxylate
Molecular Formula:
C12H19N2O3-

EP impurity B/USP related compound B

CAS No: 95153-31-4
Chemical Name:
(2S,3aS,7aS)-1-[(2S)-2-[[(1S)-1-carboxybutyl]amino]propanoyl]octahydro-1H-indole-2-carboxylic acid
Molecular Formula:
C17H28N2O5

EP impurity C/USP related compound C

CAS No: 129970-99-6
Chemical Name:
(2S)-2-[(3S,5aS,9aS,10aS)-3-methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl]pentanoic acid
Molecular Formula:
C17H26N2O4

EP impurity D/USP related compound D

CAS No: 130061-28-8
Chemical Name:
(2S)-2-[(3S,5aS,9aS,10aR)-3-methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl]pentanoic acid
Molecular Formula:
C17H26N2O4

EP impurity F/USP related compound F

CAS No: 129970-98-5
Chemical Name:
ethyl (2S)-2-[(3S,5aS,9aS,10aS)-3-methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl]pentanoate
Molecular Formula:
C19H30N2O4

Reference standared

CAS No: 107133-36-8 82834-16-0 (free base)
Chemical Name:
2-Methylpropan-2-amine (2S,3aS,7aS)-1-[(2S)-2-[[(1S)-1-(ethoxycarbonyl)butyl]amino]propanoyl]octahydro-1H-indole-2-carboxylate
Molecular Formula:
C23H43N3O5

Benzyl ester

CAS No: 122454-52-8
Chemical Name:
Benzyl ester of (2S, 3aS, 7aS)-1- [2-[1- (ethoxycarbonyl) -(S)- butylamino] -(S)-propionyl]octahydroindole-2-carboxylic acid
Molecular Formula:
C26H38N2O5