938002-52-9

1-ethyl-7-methyl-4-oxo-2-sulfanyl-1H,4H-pyrido[2,3-d]pyrimidine-5-carboxylic acid 1-Ethyl-2-mercapto-7-methyl-4-oxo-1,4-dihydropyrido[2,3-d]pyrimidine-5-carboxylic acid 1-Ethyl-7-methyl-4-oxo-2-thioxo-1,2,3,4-tetrahydropyrido[2,3-d]pyrimidine-5-carboxylic acid Pyrido[2,3-d]pyrimidine-5-carboxylic acid, 1-ethyl-1,2,3,4-tetrahydro-7-methyl-4-oxo-2-thioxo-