4-Hydroxy-2-methylsulfanyl-pyrimidine-5-carboxylic acid

4-Hydroxy-2-methylmercaptopyrimidine-5-carboxylic acid

4-Hydroxy-2-(methylthio)pyrimidine-5-carboxylic acid

2-methylsulfanyl-6-oxo-1H-pyrimidine-5-carboxylic acid