Showing structure for 4,5,17-trihydroxy-14,18-dimethyl-6-methylidene-9,16-dioxo-3,10-dioxapentacyclo[9.8.0.0¹,⁷.0⁴,¹⁹.0¹³,¹⁸]nonadec-14-en-8-yl 2-methylbutanoate