Synonyms: 2H,7H-Cyclobuta[1,4]cyclobuta[1,2,3-cd]furo[2,3-g]benzofuran-2,7-dione,3,4,4aa,4b,5,5ab,8,8aa,8bb,8cb-decahydro-4bb-methyl-8-methylene- (8CI);2H,7H-Cyclobuta[1,4]cyclobuta[1,2,3-cd]furo[2,3-g]benzofuran-2,7-dione,decahydro-4b-methyl-8-methylene-, [4aS-(2aS*,4aa,4bb,5ab,8aa,8bb,8cb)]-; Photoisabelin