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