['CNC(=O)[C@H](C)O', 'O=Cc1ccc(OC(F)(F)F)cc1', 'CN', 'C[C@@H](C=O)OC(=O)c1ccc(OC(F)(F)F)cc1', 'CCC(=O)NC', 'O=C(O)c1ccc(OC(F)(F)F)cc1', 'OC(F)(F)F', 'CNC(=O)[C@H](C)OC(=O)c1ccccc1', 'CNC(=O)[C@H](C)OC=O', 'FC(F)(F)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.