['CC(C)C=O', 'CC(C)N(C)C(=O)N1CCNCC1', 'CC(C)N(C)C=O', 'CC(C)C(=O)N1CCNCC1', 'CNC(C)C', 'CC(C)C(=O)N1CCN(C=O)CC1', 'CCC', 'CNC(=O)N1CCN(C(=O)C(C)C)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CNCCN1.