['NC(=O)C(N)C(N)=O', 'O=Cc1ccn(-c2cccc(F)c2)n1', 'NC(=O)CC(N)=O', 'NC(=O)c1ccn(-c2cccc(F)c2)n1', 'NC(=O)C(NC=O)C(N)=O', 'Fc1cccc(-n2cccn2)c1', 'Fc1ccccc1', 'NC(=O)C(NC(=O)c1cc[nH]n1)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-n2cccn2)cc1.