Showing structure for 11,18,19,21-tetrahydroxy-7,7-dimethyl-16-(prop-1-en-2-yl)-2,8-dioxapentacyclo[12.8.0.0³,¹².0⁴,⁹.0¹⁷,²²]docosa-1(14),3,5,9,11,17,19,21-octaen-13-one