['NCC(F)(F)F', 'N/C(Cc1ccccc1Cl)=N\\OCC=O', 'CC(=O)NCC(F)(F)F', 'N/C(Cc1ccccc1Cl)=N\\O', 'CC(F)(F)F', 'NC(=O)CO/N=C(\\N)Cc1ccccc1Cl', 'Clc1ccccc1', 'C/C(N)=N/OCC(=O)NCC(F)(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.