3-{8-[(2E)-3-{6'-[3-(3,11-dimethyl-1,7-dioxaspiro[5.5]undec-2-yl)-1-hydroxybutyl]-8'-hydroxy-7'-methylideneoctahydro-3H,3'H-spiro[furan-2,2'-pyrano[3,2-b]pyran]-5-yl}-1-methylprop-2-en-1-yl]-5-(hexadecanoyloxy)-10-methyl-1,7-dioxaspiro[5.5]undec-10-en-2-y