6-(benzoyloxy)-4-((benzoyloxy)methyl)-1a alpha, 2 alpha,5 beta,5a beta,6 beta,9 alpha,10,10a alpha- octahydro-5,5a-dihydroxy-1,1,7,9-tetramethyl-1H-2,8a alpha-methanocyclopenta(a)cyclopropa(e)cyclo decen-11-one