Bakkenolide E

(-)-Bakkenolide E

(1'R,3R,7'aβ)-1'β-Acetoxy-3'aβ,4'β-dimethyl-4-methylene-7'α-[[(2E)-2-methyl-2-butenoyl]oxy]spiro[oxolane-3,2'-hydrindane]-2-one

(E)-2-Methyl-2-butenoic acid [(3R)-3'α-acetoxy-1',3',3'aα,4,4',5,5',6',7',7'a-decahydro-7'α,7'aα-dimethyl-4-methylene-2-oxospiro[furan-3(2H),2'-[2H]inden]-4'β-yl] ester