['Cc1cccc(C=O)c1N', 'COCCN(CCOC)C(=O)CO', 'COCCNCCOC', 'Cc1cccc(C(=O)OCC=O)c1N', 'CO', 'CCN(CCOC)C(=O)COC(=O)c1cccc(C)c1N', 'Cc1cccc(C(=O)O)c1N', 'COCCN(CCOC)C(C)=O', 'CCOC', 'COCCNC(=O)COC(=O)c1cccc(C)c1N', 'Cc1ccccc1N', 'COCCN(CCOC)C(=O)COC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.