5,8-Etheno-1H-cyclobuta(d)(1,2,4)triazolo(1,2-a)pyridazine-1,3,6(2H,7H)-trione, 5,5a,7a,8-tetrahydro-2-phenyl-;5,8-Etheno-1H-cyclobuta[d][1,2,4]triazolo[1,2-a]pyridazine-1,3,6(2H,7H)-trione, 5,5a,7a,8-tetrahydro-2-phenyl-
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