Showing structure for (2e,4e)-5-[(1r,4s,7s,8s,9r)-7-(acetyloxy)-4-hydroxy-4,9-dimethyl-11-oxo-10-oxatricyclo[6.3.2.0¹,⁷]tridec-2-en-9-yl]-2-methylpenta-2,4-dienoic acid