['CN', 'O=[SH](=O)c1ccc2c(c1)CCN2S(=O)(=O)c1cccs1', 'O=[SH](=O)c1cccs1', 'CNS(=O)(=O)c1ccc2c(c1)CCN2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1cccs1)N1CCc2ccccc21.