Showing structure for (1s,4s,9s,10r,13r,16r,18r,19r)-5,5,9-trimethyl-14-oxo-15,17-dioxapentacyclo[11.5.1.0¹,¹⁰.0⁴,⁹.0¹⁶,¹⁹]nonadecan-18-yl acetate