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