1,2,3,6-Tetrahydro-3,6-dioxopyridazine 1,2-Dihydro-3,6-pyradizinedione 1,2-Dihydro-3,6-pyridazinedione 1,2-Dihydropyridazine-3,6-dione 10071-13-3 123-33-1 220787-04-2 3(2H)-Pyridazinone,