1H-cycloprop[e]azulene-2,6-dione, 1a,3,4,4a,5,7b-hexahydro-3,3,5,7b-tetramethyl-, (1aR,4aR,5R,7bS)- 3,3,5,7b-Tetramethyl-1a,3,4,4a,5,7b-hexahydro-1H-cyclopropa[e]azulene-2,6-dione InChI=1/C15H20O2/c1-8-9-6-14(2,3)13(17)11-7-15(11,4)10(9)5-12(8)16/h5,8-9,11H,6-7H2,1-4H3/t8-,9-,11+,15-/m1/s Isoomphadione rel-(1aR,4aR,5R,7bS)-3,3,5,7b-tetramethyl-1a,3,4,4a,5,7b-hexahydro-1H-cyclopropa[e]azulene-2,6-dione