6-benzoyl-1,2,3,4,7,8-hexahydro-3-methyl-8-n-butyl-2,4,7-trioxopyrido<2,3-d>pyrimidine
8-Butyl-3-methyl-2,4-dioxo-7-phenyl-2,3,4,8-tetrahydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid
10-Butyl-8-hydroxy-3-methyl-10H-pyrimido[4,5-b]quinoline-2,4-dione
10-butyl-3-methyl-10H-pyrimido[4,5-b]quinoline-2,4-dione
ethyl 2,3,4,8-tetrahydro-3-methyl-2,4-dioxopyrido-7-phenyl-8-butyl<2,3-d>pyrimidine-6-carboxylate