['CCO', 'CN(CC=O)Cc1cccc(OC(F)F)c1', 'CC', 'CN(CC(=O)O)Cc1cccc(OC(F)F)c1', 'OC(F)F', 'CCOC(=O)CN(C)Cc1ccccc1', 'CCOC(C)=O', 'CNCc1cccc(OC(F)F)c1', 'CCOC(=O)CNC', 'Cc1cccc(OC(F)F)c1', 'CCOC(=O)CN(C)C', 'FC(F)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.