1-Phenyl-2,3,5,6-tetrahydro-2-thioxo-1H-imidazo[4,5-d]pyridazine-4,7-dione 1-Phenyl-2-mercapto-4,7-dihydroxy-1,3,5,6-tetraazaindene 1H-Imidazo[4,5-d]pyridazine-4, 7-dione, 2,3,5,6-tetrahydro-1-phenyl-2-thioxo- (9CI) 63886-80-6 AIDS-044189 AIDS044189 NSC9346