['CO', 'CN(CCC=O)Cc1csc(Br)c1', 'CCC(=O)OC', 'CNCc1csc(Br)c1', 'Cc1csc(Br)c1', 'CNCCC(=O)OC', 'Brc1cccs1', 'COC(=O)CCN(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccsc1.