4(1H)-Pyrimidinone, 2,3-dihydro-2-thioxo-, 4-Hydroxy-2-mercaptopyrimidine, DERACIL, THIURACIL, Thiouracil, tiouracyl, 2-Mercapto-4-pyrimidone, Thiouraci, 4-oxo-2-thioxo-1,2,3,4-tetrahydropyrimidine, 2-Mercapto-4-hydroxypyrimidine, 2,3-dihydro-2-thioxo-(1H)pyrimidin-4-one, Nobilen, 2-TU, 2-Thiouracil, 2-Thioxo-1,2,3,4-tetrahydropyrimidin-4-one