Showing structure for n-{5,19-dimethoxy-6-oxo-15,17-dioxapentacyclo[10.7.0.0²,⁸.0³,⁷.0¹⁴,¹⁸]nonadeca-1(19),2(8),4,12,14(18)-pentaen-9-yl}ethanimidic acid