['CNC', 'O=CNCCCNC(=O)c1ccccc1F', 'CN(C)C=O', 'NCCCNC(=O)c1ccccc1F', 'O=Cc1ccccc1F', 'CN(C)C(=O)NCCCN', 'CN(C)C(N)=O', 'CCCNC(=O)c1ccccc1F', 'CCCNC(=O)N(C)C', 'NC(=O)c1ccccc1F', 'Fc1ccccc1', 'CN(C)C(=O)NCCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.