['NCCCC(=O)O', 'Cc1ccc(OCC=O)cc1C', 'Cc1ccc(O)cc1C', 'CC(=O)NCCCC(=O)O', 'Cc1ccccc1C', 'O=C(O)CCCNC(=O)CO', 'CCCC(=O)O', 'Cc1ccc(OCC(N)=O)cc1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.