['NCC(F)(F)F', 'CN(CC=O)Cc1cccc(C#N)c1', 'CC(=O)NCC(F)(F)F', 'CNCc1cccc(C#N)c1', 'CC(F)(F)F', 'CN(CC(N)=O)Cc1cccc(C#N)c1', 'Cc1cccc(C#N)c1', 'CNCC(=O)NCC(F)(F)F', 'N#Cc1ccccc1', 'CN(C)CC(=O)NCC(F)(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.