['CCO', 'O=CCCNC(=O)c1ccc(F)cc1', 'CCOC(=O)CCN', 'O=Cc1ccc(F)cc1', 'CC', 'O=C(O)CCNC(=O)c1ccc(F)cc1', 'CCOC(=O)CC', 'NC(=O)c1ccc(F)cc1', 'Fc1ccccc1', 'CCOC(=O)CCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.