Showing structure for 10,13-dihydroxy-6-methyl-7,18-dioxo-5-oxapentacyclo[9.7.0.0²,⁸.0⁴,⁶.0¹²,¹⁷]octadeca-1(11),2(8),9,12,14,16-hexaen-3-yl 2-methylbutanoate