['Nc1cccnc1Cl', 'C[C@@H]1CN([C@H](C)C=O)C[C@@H](C)O1', 'C[C@@H]1CNC[C@@H](C)O1', 'CCC(=O)Nc1cccnc1Cl', 'Clc1ccccn1', 'C[C@@H]1CN([C@H](C)C(N)=O)C[C@@H](C)O1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(CN1CCOCC1)Nc1cccnc1.