IUPAC:(1R,3R,6R,10S,12S,13S,16S,19S)-3,10,12,16-tetramethyl-14-methylidene-15,17-dioxo-18,20-dioxatetracyclo[11.5.2.0^{1,6}.0^{16,19}]icos-4-ene-4-carboxylic acid
IUPAC:(1R,3R,6R,10S,12S,13S,16S,19S)-3,10,12,16-tetramethyl-14-methylidene-15,17-dioxo-18,20-dioxatetracyclo[11.5.2.0^{1,6}.0^{16,19}]icos-4-ene-4-carboxylic acid