IUPAC:(1'R,2R,2'S,4'S,5R,7'S,8'R,9'S,12'S,13'R)-5,7',9',13'-tetramethyl-5'-oxaspiro[oxane-2,6'-pentacyclo[10.8.0.0^{2,9}.0^{4,8}.0^{13,18}]icosan]-17'-ene-10',16'-dione
IUPAC:(1'R,2R,2'S,4'S,5R,7'S,8'R,9'S,12'S,13'R)-5,7',9',13'-tetramethyl-5'-oxaspiro[oxane-2,6'-pentacyclo[10.8.0.0^{2,9}.0^{4,8}.0^{13,18}]icosan]-17'-ene-10',16'-dione