['Cc1n[nH]c(=O)c(C=O)c1C', 'C[C@H]1C[C@H](N)c2ccsc2S1(=O)=O', 'Cc1cc(=O)[nH]nc1C', 'C[C@H]1C[C@H](NC=O)c2ccsc2S1(=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(N[C@H]1CCS(=O)(=O)c2sccc21)c1ccn[nH]c1=O.