4,6(1H,5H)-Pyrimidinedione, dihydro-5-((4-hydroxy-3-iodo-5-methoxyphenyl)methylene)-2-thioxo- (9CI) 5-(5-Iodovanillylidene)-2-thiobarbituric acid 73681-09-1 BARBITURIC ACID, 5-(5-IODOVANILLYLIDENE)-2-THIO- NSC 90733