['CC(N)C(=O)NC(C)(C)C', 'CS(=O)(=O)N1CCC(C=O)CC1', 'CC(C)(C)N', 'CC(C=O)NC(=O)C1CCN(S(C)(=O)=O)CC1', 'CCC(=O)NC(C)(C)C', 'CS(=O)(=O)N1CCC(C(N)=O)CC1', 'CC(C)C', 'CC(NC(=O)C1CCN(S(C)(=O)=O)CC1)C(N)=O', 'C[SH](=O)=O', 'CC(NC(=O)C1CCNCC1)C(=O)NC(C)(C)C', 'CS(=O)(=O)N1CCCCC1', 'CC(NC=O)C(=O)NC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.