['CO', 'CC(Oc1cccc(C#N)c1)C(=O)N(C)CCCC=O', 'CNCCCC(=O)OC', 'CC(C=O)Oc1cccc(C#N)c1', 'N#Cc1cccc(O)c1', 'CCC(=O)N(C)CCCC(=O)OC', 'N#Cc1ccccc1', 'COC(=O)CCCN(C)C(=O)C(C)O', 'CCCC(=O)OC', 'CNC(=O)C(C)Oc1cccc(C#N)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.