1,3-Dimethyl-6-nitro-7-(2-oxo-1-pyrrolidinyl)pyrido(2,3-d)pyrimidine-2,4,5(1H,3H,8H)-trione 141985-50-4 Pyrido(2,3-d)pyrimidine-2,4,5(1H,3H,8H)-trione, 1,3-dimethyl-6-nitro-7-(2-oxo-1-pyrrolidinyl)-