Showing structure for (1s,2s,3r,5r,6s,8r,10s)-18-(methoxycarbonyl)-2,6-dimethyl-21-oxo-14-oxa-8-azahexacyclo[11.6.1.1¹,⁵.0²,¹⁰.0³,⁸.0¹⁷,²⁰]henicosa-13(20),17-dien-8-ium-8-olate