CAS: 66147-29-3 Molecular Formula: C21 H24 N8 O5 Molecular Weight (g/mol): 468.47 Synonym: L-Glutamic acid, N-[4-[[(2,4-diamino-6-pteridinyl)methyl]methylamino]benzoyl]-, 1-methyl ester,Methotrexate α-methyl ester,Methotrexate 1-Methyl Ester,Methotrexate Imp. I (EP),N-[4-[[(2,4-Diamino-6-pteridinyl)methyl]methylamino]benzoyl]-L-glutamic Acid 1-Methyl Ester,EP Methotrexate Impurity I IUPAC Name: (4S)-4-[[4-[(2,4-diaminopteridin-6-yl)methyl-methylamino]benzoyl]amino]-5-methoxy-5-oxopentanoic acid SMILES: NC=1C2=C(N=CC(CN(C)C3=CC=C(C(N[C@@H](CCC(O)=O)C(OC)=O)=O)C=C3)=N2)N=C(N)N1