5,8-Ethano-1H-(1,2,4)triazolo(1,2-a)pyridazine-1,3(2H)-dione, 5-ethenyltetrahydro-2-methyl-;5,8-Ethano-1H-[1,2,4]triazolo[1,2-a]pyridazine-1,3(2H)-dione, 5-ethenyltetrahydro-2-methyl-
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