7,​11-​Methano-​1H-​cyclodeca[3,​4]​benz[1,​2-​b]​oxete-​5,​6-​dione, 12b-​(acetyloxy)​-​12-​(benzoyloxy)​-​2a,​3,​4,​4a,​9,​10,​11,​12,​12a,​12b-​decahydro-​4,​9,​11-​trihydroxy-​4a,​8,​13,​13-​tetramethyl-​, (2aR,​4R,​4aS,​9S,​11S,​12S,​12aR,​12bS)​-