Showing structure for 13-(acetyloxy)-7-chloro-2,12-dihydroxy-1,11,15-trimethyl-6-methylidene-10-oxo-4,9,18-trioxapentacyclo[12.5.0.0³,⁵.0⁸,¹².0¹⁷,¹⁹]nonadecan-16-yl butanoate