['C#CCN', 'CS(=O)(=O)Nc1ccc(C=O)cc1', 'C#CC', 'CS(=O)(=O)Nc1ccc(C(N)=O)cc1', 'C[SH](=O)=O', 'C#CCNC(=O)c1ccc(N)cc1', 'CS(N)(=O)=O', 'C#CCNC(=O)c1ccccc1', 'C#CCNC=O', 'CS(=O)(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.