['CCO', 'Cc1csc(C(O)(CC(=O)NNC=O)C(F)(F)F)n1', 'CC', 'Cc1csc(C(O)(CC(=O)NNC(=O)O)C(F)(F)F)n1', 'Cc1cscn1', 'CCOC(=O)NNC(=O)CC(O)C(F)(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cscn1.