IUPAC:methyl (1S,3S,7S,12R,15R,16S,17S,18R,20E)-12-(3,4-dihydroxyphenyl)-20-ethylidene-16,17,18-trihydroxy-9-oxo-2,4,10,13,19-pentaoxatricyclo[13.3.1.1^{3,7}]icos-5-ene-6-carboxylate
IUPAC:methyl (1S,3S,7S,12R,15R,16S,17S,18R,20E)-12-(3,4-dihydroxyphenyl)-20-ethylidene-16,17,18-trihydroxy-9-oxo-2,4,10,13,19-pentaoxatricyclo[13.3.1.1^{3,7}]icos-5-ene-6-carboxylate