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