['CO', 'CN(C)C(C(=O)NCCCC=O)c1ccccc1', 'COC(=O)CCCN', 'CN(C)C(C=O)c1ccccc1', 'CCCC(=O)OC', 'CN(C)C(C(N)=O)c1ccccc1', 'CNC', 'COC(=O)CCCNC(=O)Cc1ccccc1', 'c1ccccc1', 'COC(=O)CCCNC(=O)CN(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.