5-Oxo-neoverrucos-(13)-ene 8-Isopropyl-1a,3a,5a-trimethyl-1a,3,3a,4,5,5a,6,7,8b,8c-decahydro-1H-cyclopenta[a]cyclopropa[h]naphthalen-2-one 8-isopropyl-1a,3a,5a-trimethyl-1a,3,3a,4,5,5a,6,7,8b,8c-decahydrocyclopenta[a]cyclopropa[h]naphthalen-2(1H)-one InChI=1/C20H30O/c1-12(2)13-6-7-18(3)8-9-19(4)11-15(21)20(5)10-14(20)17(19)16(13)18/h12,14,17H,6-11H2,1-5H cyclopenta[a]cyclopropa[h]naphthalen-2(1H)-one, 1a,3,3a,4,5,5a,6,7,8b,8c-decahydro-1a,3a,5a-trimethyl-8-(1-methylethyl)-