['NC(=O)NCC(F)(F)F', 'O=CCN1CCCc2cc(F)ccc21', 'O=CNCC(F)(F)F', 'NC(=O)CN1CCCc2cc(F)ccc21', 'NCC(F)(F)F', 'O=CNC(=O)CN1CCCc2cc(F)ccc21', 'Fc1ccc2c(c1)CCCN2', 'CC(=O)NC(=O)NCC(F)(F)F', 'CC(F)(F)F', 'NC(=O)NC(=O)CN1CCCc2cc(F)ccc21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCCN2.