Showing structure for (1r,3e,6e,17s)-10,17,21-trihydroxy-7-(hydroxymethyl)-4,18,18-trimethyl-19-oxatetracyclo[10.7.1.1⁹,¹³.0¹,¹⁵]henicosa-3,6,9(21),10,12,15-hexaene-14,20-dione