L-Glutamic acid, N-[4-[2-(2-amino-1,4,5,6,7,8-hexahydro-4-oxopyrido[2,3-d]pyrimidin-6-yl)ethyl]benzoyl]-, (R)- Lometrexol NSC660025 Pyrido[2,3-d]pyrimidine, L-glutamic acid deriv.