89579-09-9 1H,5H-[1,2,4]Triazolo[1,2-a][1,2,4]triazole-1,3(2H)-dione,2,5,5-trimethyl-7-(methylthio)- 25540-43-6 5,8-Etheno-1H-cyclobuta[d][1,2,4]triazolo[1,2-a]pyridazine-1,3(2H)-dione,5,5a,6,7,7a,8-hexahydro- 25547-29-9 5,7-Etheno-1H,5H-cyclopropa[d][1,2,4]triazolo[1,2-a]pyridazine-1,3(2H)-dione,5a,6,6a,7-tetrahydro- (9CI)