7-Oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid
2-Methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid
2-Methoxy-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid
Methyl 2-methoxy-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylate