Showing structure for (1s,3r,6s,9s,10r,11s,15s,17r,19s,20r)-17-ethoxy-15-methoxy-3,6,19-trimethyl-9-(prop-1-en-2-yl)-16-oxapentacyclo[12.5.1.0³,¹¹.0⁶,¹⁰.0¹⁷,²⁰]icos-13-ene