IUPAC:(1R,2R,4R,10R,11S,14S,15S,16S,18S,19S)-10,14-dimethylspiro[hexacyclo[9.8.0.0^{2,4}.0^{5,10}.0^{14,19}.0^{16,18}]nonadecane-15,2'-oxolane]-5,8-diene-5',7-dione
IUPAC:(1R,2R,4R,10R,11S,14S,15S,16S,18S,19S)-10,14-dimethylspiro[hexacyclo[9.8.0.0^{2,4}.0^{5,10}.0^{14,19}.0^{16,18}]nonadecane-15,2'-oxolane]-5,8-diene-5',7-dione