Showing structure for 6-{6-hydroxy-2-methyl-10-oxo-4,8,19-trioxaheptacyclo[15.2.2.0¹,¹².0²,⁹.0³,⁵.0⁷,⁹.0¹³,¹⁷]henicos-11-en-16-yl}-2,3-dimethylhept-4-enoic acid