['CC', 'O=C1NCCC1NS(=O)(=O)C1CC1', 'O=[SH](=O)C1CC1', 'CCNC1CCNC1=O', 'O=C1CCCN1', 'CCNS(=O)(=O)C1CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1NCCC1NS(=O)(=O)C1CC1.