['C#CCN', 'CNS(=O)(=O)c1ccc(Cl)c(C=O)c1', 'C#CC', 'CNS(=O)(=O)c1ccc(Cl)c(C(N)=O)c1', 'CN', 'C#CCNC(=O)c1cc([SH](=O)=O)ccc1Cl', 'C#CCNC=O', 'CNS(=O)(=O)c1ccc(Cl)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.