Showing structure for 8,9-dihydroxy-15-(2-hydroxybutanoyl)-7-methoxy-6,18-dimethyl-3,5,19-trioxapentacyclo[11.6.1.0²,¹⁰.0⁴,⁹.0¹⁶,²⁰]icosa-1(20),2(10),12,15,17-pentaene-11,14-dione