1,2-Dihydro-3,6-pyridazinedione sodium salt 1,2-Dihydropyridazine-3,6-dione, sodium salt 28330-26-9 3,6-Pyridazinedione, 1,2-dihydro-, sodium salt Betrina EINECS 248-972-7 GMK-Na Maleic acid hydrazide sodium salt Maleic hydrazide sodium salt