Showing structure for (1s,2r,7s,8z,12r,13s,14s,16r,17r)-2,14-bis(acetyloxy)-16-hydroxy-4,9,13,17-tetramethyl-5-oxo-6-oxatricyclo[11.4.0.0³,⁷]heptadeca-3,8-dien-12-yl butanoate