5-Hexadecyl methotrexate 88887-42-7 Hexadecyl-mtx L-Glutamic acid, N-(4-(((2,4-diamino-6-pteridinyl)methyl)methylamino)benzoyl)-, 5-hexadecyl ester N-(4-(((2,4-Diamino-6-pteridinyl)methyl)methylamino)benzoyl)glutamic acid 5-hexadecyl ester