['CCCC', 'CCCNc1nnc(S(=O)(=O)CCO)s1', 'CCCCO', 'CCCNc1nnc(S(=O)(=O)CC)s1', 'CCC', 'CCCCOCCS(=O)(=O)c1nnc(N)s1', 'CCCN', 'CCCCOCCS(=O)(=O)c1nncs1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nncs1.