Pemetrexed EP Impurity B

Chemical Name: (2S,2′S)-2,2′-[(45R)-42,52-Diamino-44,46,54-trioxo-41,44,46,47,54,57-hexahydro-45H,51H-4(5,5),5(6,5)-dipyrrolo[2,3-d]pyrimidina-1,8(1)-dibenzenaoctaphane-14,84-dicarboxamido]dipentanedioic acid (as per EP)

Smile: O=C(N[C@@](CCC(O)=O)(C(O)=O)[H])C(C=C1)=CC=C1CCC2=C([C@@](C(N3)=O)(CCC4=CC=C(C(N[C@]([H])(C(O)=O)CCC(O)=O)=O)C=C4)C5=C3NC(N)=NC5=O)NC(NC(N)=N6)=C2C6=O