['NCC(F)(F)F', 'C[C@H](c1ccc(-n2cncn2)cc1)N(C)CC=O', 'CNCC(=O)NCC(F)(F)F', 'CCc1ccc(-n2cncn2)cc1', 'CC(=O)NCC(F)(F)F', 'CN[C@H](C)c1ccc(-n2cncn2)cc1', 'CC(F)(F)F', 'C[C@H](c1ccc(-n2cncn2)cc1)N(C)CC(N)=O', 'c1ccc(-n2cncn2)cc1', 'CCN(C)CC(=O)NCC(F)(F)F', 'c1nc[nH]n1', 'C[C@H](c1ccccc1)N(C)CC(=O)NCC(F)(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-n2cncn2)cc1.