['CC(C)(C)NC=O', 'CN(C)S(=O)(=O)C1CCCNC1', 'CC(C)(C)N', 'CN(C)S(=O)(=O)C1CCCN(C=O)C1', 'CC(C)C', 'CN(C)S(=O)(=O)C1CCCN(C(N)=O)C1', 'CNC', 'CC(C)(C)NC(=O)N1CCCC([SH](=O)=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.