Phthalic acid cyclic hydrazide;1,2-Benzenedicarboxylicacid, cyclic hydrazide;1,4-Phthalazinediol;2,3-Dihydro-1,4-phthalazinedione;Hydrazine,1,2-(1,2-phenylenedicarbonyl)-;Phthalazine-1,4(2H,3H)-dione;
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