['OC(F)(F)F', 'NC(=O)c1nnn(-c2ccccc2)c1N', 'NC=O', 'Nc1cnnn1-c1ccc(OC(F)(F)F)cc1', 'NC(=O)c1nn[nH]c1N', 'FC(F)(F)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-n2ccnn2)cc1.