Pemetrexed Pemetrexed Synonyms: 2-[4-[2-(4-Amino-2-oxo-3,5,7-triazabicyclo[4.3.0]nona-3,8,10-trien-9-yl)ethyl]benzoyl]aminopentanedioic acid disodium salt CAS NO.: 150399-23-8 Formula: C20H19N5Na2O6 Weight: 471.37