Showing structure for (1r,2s,4s,7s,9r,10e,13r,15s,16s)-13-(acetyloxy)-4,8,8,11,15-pentamethyl-12-oxo-3-oxatetracyclo[11.3.0.0²,⁴.0⁷,⁹]hexadec-10-en-16-yl 2-methylpropanoate