['CC(C)(C)C=O', 'CS(=O)(=O)N1CCCC(N)C1', 'C[SH](=O)=O', 'CC(C)(C)C(=O)NC1CCCNC1', 'CC(C)(C)C(N)=O', 'CS(=O)(=O)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.