Showing structure for (1s,4r,5s,8r,9r,11r,12s,13r,14r,16r,18s)-5,11-dihydroxy-9,16-dimethyl-8-(6-oxopyran-3-yl)-15,17,20-trioxahexacyclo[14.3.1.1¹⁴,¹⁸.0¹,¹³.0⁴,¹².0⁵,⁹]henicosane-13-carbaldehyde