['NCC(F)(F)F', 'CN(CC=O)Cc1ccccc1[N+](=O)[O-]', 'CC(=O)NCC(F)(F)F', 'CNCc1ccccc1[N+](=O)[O-]', 'CC(F)(F)F', 'CN(CC(N)=O)Cc1ccccc1[N+](=O)[O-]', 'Cc1ccccc1[N+](=O)[O-]', 'CNCC(=O)NCC(F)(F)F', 'O=[N+]([O-])c1ccccc1', 'CN(C)CC(=O)NCC(F)(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.