['Cc1c([SH](=O)=O)cnn1C', 'NC(=O)C1NCC2CCCC21', 'NC=O', 'Cc1c(S(=O)(=O)N2CC3CCCC3C2)cnn1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1cn[nH]c1)N1CC2CCCC2C1.