Showing structure for 4,13,17-trihydroxy-4',5',10,16,20-pentamethyl-3'h-14-oxaspiro[pentacyclo[11.6.1.0²,¹¹.0⁵,¹⁰.0¹⁷,²⁰]icosane-15,2'-pyran]-5,7-diene-6',9-dione