['COC(C)C=O', 'CNCc1cscn1', 'CO', 'CCC(=O)N(C)Cc1cscn1', 'Cc1cscn1', 'CNC(=O)C(C)OC', 'c1cscn1', 'COC(C)C(=O)N(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cscn1.