68352-95-4 Butanoic acid, 2-((4-(((2,4-diamino-6-pteridinyl)methyl)methylamino)benzoyl)amino)-, (+-)- Butyric acid, 2-(p-(((2,4-diamino-6-pteridinyl)methyl)methylamino)benzamido)-, (+-)- DL-2-(p-(((2,4-Diamino-6-pteridinyl)methyl)methylamino)benzamido)butyric acid