['O=Cc1ccco1', 'O=C(O)[C@@H]1CS(=O)(=O)CN1', 'O=CO', 'O=C(c1ccco1)N1CCS(=O)(=O)C1', 'c1ccoc1', 'O=CN1CS(=O)(=O)C[C@H]1C(=O)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(c1ccco1)N1CCS(=O)(=O)C1.