['CS(N)(=O)=O', 'CCCSC1=Nc2ccccc2CS1', 'CCCNS(C)(=O)=O', 'SC1=Nc2ccccc2CS1', 'C[SH](=O)=O', 'NCCCSC1=Nc2ccccc2CS1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1=Nc2ccccc2CS1.