(3S,4S,6R,8S)-8-((2R,3aS,5R,5'R,6S,6''S,7aS)-6''-((E)-5-acetoxypent-1-en-1-yl)-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-2-yl)-8-hydroxy-4,6-dimethyl-2-methylene-7-oxooctane-1,3-diyl diacetate