4,6(1H,5H)-Pyrimidinedione, dihydro-5-(2-pyridinylmethylene)-2-thioxo- (9CI) 5-(2-Pyridylmethylene)-2-thiobarbituric acid 73664-50-3 BARBITURIC ACID, 5-((2-PYRIDYL)METHYLENE)-2-THIO- Barbituric acid, 5-(2-pyridylmethylent)-2-thio- NSC 89387