3,6-Pyridazinedione, tetrahydro- (8CI)(9CI) 502-95-4 Butanedioic acid, cyclic hydrazide Hexahydro-3,6-pyridazinedione NSC 15048 Succinic acid, cyclic hydrazide Succinic hydrazide Tetrahydro-3,6-pyridazinedione