['SC1=NCCN1', 'Cc1ccc(C(F)(F)F)cc1', 'FC(F)F', 'c1ccc(CSC2=NCCN2)cc1', 'CSC1=NCCN1', 'FC(F)(F)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(CSC2=NCCN2)cc1.