Showing structure for (1r,2s,6s,7r,8s,12s,13s,14r,15r,16s,17r)-2,7,12,15,16-pentahydroxy-9,13,17-trimethyl-5,18-dioxapentacyclo[12.5.0.0¹,⁶.0²,¹⁷.0⁸,¹³]nonadec-9-ene-4,11-dione