8W5 8w5 (1~{S},2~{S},4~{R},6~{R},8~{S},9~{S},11~{S},12~{S},13~{R})-9,13-dimethyl-11-oxidanyl-8-(2-oxidanylethanoyl)-6-propyl-5,7-dioxapentacyclo[10.8.0.0^{2,9}.0^{4,8}.0^{13,18}]icosa-14,17-dien-16-one 8W5