Methotrexate EP Impurity E (HCl Salt)

Chemical Name: 4-[[(2,4-diaminopteridin-6-yl)methyl]methylamino]benzoic acid Hemihydrochloride; Benzoic acid, 4-[[(2,4-diamino-6-pteridinyl)methyl]methylamino]-, hydrochloride (2:1)

Synonym:  Methotrexate Related Compound E (USP);

Smile: O=C(O)C1=CC=C(N(CC2=NC3=C(N)N=C(N)N=C3N=C2)C)C=C1.Cl