Pemetrexed EP Impurity A Sodium Salt

Chemical Name: (2S)-2-[4-[2-(2-Amino-1-methyl-4-oxo-4,7-dihydro-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzamido]pentanedioic acid Sodium salt (as per EP); {4-[2-(2-Amino-1-methyl-4-oxo-4,7-dihydro-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl}-l-glutamic acid Sodium salt (as per USP)

Smile: O=C(O)CC[C@@H](C(O)=O)NC(C1=CC=C(CCC2=CNC(N(C)C(N)=N3)=C2C3=O)C=C1)=O.[Na]