Dendrillolide A

(5R)-5β-Acetoxy-4α-[[(3aα,8aα)-decahydro-1,4,4-trimethyl-8-methyleneazulen]-1α-yl]tetrahydrofuro[2,3-b]furan-2(3H)-one

(1S,5R,8S)-6α-Acetoxy-8-[(1R,3aα,8aα)-decahydro-8-methylene-1,4,4-trimethylazulen-1α-yl]-2,7-dioxabicyclo[3.2.1]octan-3-one