Ajugareptansone B

(1R)-8α-Acetyloxy-8aα-(acetyloxymethyl)-5β-[2-(2,5-dihydro-5-oxofuran-3-yl)ethyl]-4aβ,5,6,7,8,8a-hexahydro-5,6α-dimethylspiro[naphthalene-1(4H),2'-oxiran]-4-one