['CCO', 'O=CCOCCOc1ccccc1', 'CC', 'O=C(O)COCCOc1ccccc1', 'CCOC(C)=O', 'OCCOc1ccccc1', 'CCOC(=O)CO', 'CCOc1ccccc1', 'Oc1ccccc1', 'CCOCC(=O)OCC', 'c1ccccc1', 'CCOC(=O)COCCO']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.