14020-53-2 2,4(1H,3H)-Pyrimidinedione, 5-mercapto- 2,4-Pyrimidinediol, 5-mercapto- 5-Mercaptouracil 5-Thioisobarbituric acid 5-Thiouracil AB 050 CBC 909463 Isobarbituric acid, 5-thio- NSC4926