['CC(C)N(C)C=O', 'CC(C)C1CCNC1', 'CNC(C)C', 'CC(C)C1CCN(C=O)C1', 'CCC', 'CNC(=O)N1CCC(C(C)C)C1', 'CCC', 'CC(C)N(C)C(=O)N1CCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNC1.