Showing structure for (1r,6s,8r,11s,12r,15s)-3,15-dimethyl-4,13-dioxo-5,14-dioxatetracyclo[6.6.1.0²,⁶.0¹²,¹⁵]pentadec-2-en-11-yl (2z)-2-methylbut-2-enoate