82144-21-6 Aspartic acid, N-(p-(((2,4-diamino-7-pteridinyl)methyl)methylamino)benzoyl)- L-Aspartic acid, N-(4-(((2,4-diamino-7-pteridinyl)methyl)methylamino)benzoyl)- N-(4-(((2,4-Diamino-7-pteridinyl)methyl)methylamino)benzoyl)-L-aspartic acid N-(p-(((2,4-Diamino-7-pteridinyl)methyl)methylamino)benzoyl)aspartic acid