25312-31-6 4-Aminopteroylaspartic acid Aminoanfol Aspartic acid, N-[p-[[(2,4-diamino-6-pteridinyl)methyl]amino]benzoyl]-, L- L-Aspartic acid, N-[4-[[(2,4-diamino-6-pteridinyl)methyl]amino]benzoyl]- NSC98535