['Nc1ccc(Cl)cc1Cl', 'CCOC(CC)C(=O)C(C#N)C=O', 'CC', 'CCC(O)C(=O)C(C#N)C(=O)Nc1ccc(Cl)cc1Cl', 'CCO', 'CCCC(=O)C(C#N)C(=O)Nc1ccc(Cl)cc1Cl', 'Clc1cccc(Cl)c1', 'CCOC(CC)C(=O)C(C#N)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.