Showing structure for [3aS-(3aalpha,4alpha,5alpha,9beta,9aalpha,9bbeta)]-5-(Acetyloxy)-2,3,3a,4,5,9,9a,9b-octahydro-9-hydroxy-6,9-dimethyl-3-methylene-2-oxoazuleno[4,5-b]furan-4-yl ester 2-methylbutanoic acid