Showing structure for (1r,2r,3r,4r,6r,8s,9e,12s,13s,14r,15s)-3,4,12,13,15-pentakis(acetyloxy)-6-hydroxy-4,8,11,11-tetramethyl-7,18-dioxo-19-oxatricyclo[13.4.0.0²,⁶]nonadec-9-en-14-yl 2-methylpropanoate