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