Showing structure for (1s,4r,5r,6r,7s,8r,11s,12r,13s,16s,17s,18s,19r)-4,5,8,16,17-pentahydroxy-6,14,18-trimethyl-9-oxo-3,10-dioxapentacyclo[9.8.0.0¹,⁷.0⁴,¹⁹.0¹³,¹⁸]nonadec-14-en-12-yl (2e)-2-methylbut-2-enoate