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