Glutamic acid, N-[p-[[[2,4-[(trimethylsilyl)amino]-6-pteridinyl]methyl]methylamino]benzoyl]-, bis(trimethylsilyl)ester, L-(+)- L-Glutamic acid, N-[4-[[[2,4-bis[(trimethylsilyl)amino]-6-pteridinyl]methyl]methylamino]benzoyl]-, bis(trimethylsilyl) ester NSC150812