['CC(C)CCC=O', 'Cc1ccc(S(=O)(=O)NCCN)cc1', 'CCNC(=O)CCC(C)C', 'Cc1ccc(S(N)(=O)=O)cc1', 'CC(C)CCC(N)=O', 'CCNS(=O)(=O)c1ccc(C)cc1', 'Cc1ccc([SH](=O)=O)cc1', 'CC(C)CCC(=O)NCCN']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.