Showing structure for (1e)-2-[(1r,4s,8r,10r,11s,13r)-1,5,5-trimethyl-9-oxo-10-(2-oxopropyl)-6-oxatricyclo[6.3.2.0⁴,¹³]tridecan-11-yl]ethenyl 3-methylbut-2-enoate