L-Glutamic acid, N-[4-[[(2,4-diamino-6-pteridinyl)methyl](2-hydroxyethyl)amino]benzoyl]- L-Glutamic acid, N-[4-[[(2,4-diamino-6-pteridinyl)methyl][2-hydroxyethyl]amino]benzoyl]-, hydrate (4:7) NSC169531