['Cc1ccco1', 'NC1CCS(=O)(=O)CC1', 'NCc1ccco1', 'O=S1(=O)CCCCC1', 'c1ccoc1', 'CNC1CCS(=O)(=O)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)CCC(NCc2ccco2)CC1.