API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Tryptophan

EP Impurity C

 (S)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid (kynurenine), Tropicamide-EP-Impurity-C
Tryptophan

EP Impurity D

 (S)-2-amino-3-(5-hydroxy-1H-indol-3-yl)propanoic acid (5-hydroxytryptophan), Tryptophan-EP-Impurity-D
Tryptophan

Tryptophan Related Compound B

 N-Acetyl-L-Tryptophan Tryptophan-Tryptophan-Related-Compound-B