Showing structure for 2,9,18-trimethyl (1r,9r,16r,18s)-13-oxo-2,12-diazapentacyclo[14.2.2.0¹,⁹.0³,⁸.0¹²,¹⁶]icosa-3,5,7,14-tetraene-2,9,18-tricarboxylate