Showing structure for methyl (1s,4s,8r,10s,11e,14s)-11-{[4-(acetyloxy)phenyl]methylidene}-12-oxo-7,9,13-trioxatetracyclo[6.5.1.0¹,¹⁰.0⁴,¹⁴]tetradeca-2,5-diene-5-carboxylate