['CO', 'O=C(O)CN1C(=O)N/C(=C\\c2ccccc2)C1=O', 'COc1ccc(C)cc1', 'O=C(O)CN1C(=O)CNC1=O', 'CC(=O)O', 'COc1ccc(/C=C2\\NC(=O)NC2=O)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1NC(=O)/C(=C/c2ccccc2)N1.