Showing structure for (5e)-6-[(1r,3r,5r,10s,14r,15r,17r,18s)-17-hydroxy-6,6,10,14,18-pentamethyl-7,13-dioxo-2-oxapentacyclo[9.7.0.0¹,³.0⁵,¹⁰.0¹⁴,¹⁸]octadec-11-en-15-yl]-2-methyl-4-oxohept-5-enoic acid