1-Deazamethotrexate 34522-28-6 BRN 0871083 L-Glutamic acid, N-(4-(((5,7-diaminopyrido(3,4-b)pyrazin-3-yl)methyl)methylamino)benzoyl)- N-(p-(((5,7-Diaminopyrido(3,4-b)pyrazin-3-yl)methyl)methylamino)benzoyl)glutamic acid SRI 4754