['NC1CC1', 'CC(C=O)NS(C)(=O)=O', 'CS(N)(=O)=O', 'CCC(=O)NC1CC1', 'C[SH](=O)=O', 'CC(N)C(=O)NC1CC1', 'C1CC1', 'CC(NS(C)(=O)=O)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CC1.