Compound 23

1,17-Dimethyl (rel-1R,15R,18R)-3,13-diazapentacyclo[13.3.1.0²,¹⁰.0⁴,⁹.0¹³,¹⁸]nonadeca-2(10),4,6,8,16-pentaene-1,17-dicarboxylate

From: Biogenetically inspired synthesis and skeletal diversification of indole alkaloids