Showing structure for methyl (9r,17s,18r,21r)-17,18-dihydroxy-2,12-diazahexacyclo[14.2.2.1⁹,¹².0¹,⁹.0³,⁸.0¹⁶,²¹]henicosa-3,5,7-triene-18-carboxylate