Showing structure for 6-hydroxy-2-methyl-4-oxo-6-[(1r,3r,5r,10s,14r,18r)-6,6,10,14,18-pentamethyl-7,13,17-trioxo-2-oxapentacyclo[9.7.0.0¹,³.0⁵,¹⁰.0¹⁴,¹⁸]octadeca-11,15-dien-15-yl]heptanoic acid