7-methyl-4-oxo-1-phenyl-2-thioxo-1,2,3,4-tetrahydro-pyrido[2,3-d]pyrimidine-5-carboxylic acid
1-Butyl-7-methyl-4-oxo-3-phenyl-2-thioxo-1,2,3,4-tetrahydro-pyrido[2,3-d]pyrimidine-5-carboxylic acid methyl ester
7-Methyl-4-oxo-1-phenyl-2-thioxo-1,2,3,4-tetrahydro-pyrido[2,3-d]pyrimidine-5-carboxylic acid methyl ester
3H-2-allylimino-7-methyl-4-oxopyrido<3,2-e>-1,3-thiazine-5-carboxylic acid methyl ester
3H-2-methylimino-7-methyl-4-oxopyrido<3,2-e>-1,3-thiazine-5-carboxylic acid methyl ester