['CO', 'COC(=O)[C@@H](NS(=O)(=O)c1cc(C=O)ccc1F)C(C)C', 'COC(=O)c1ccc(F)c(S(=O)(=O)N[C@H](C=O)C(C)C)c1', 'COC(=O)CC(C)C', 'COC(=O)c1ccc(F)c(S(N)(=O)=O)c1', 'COC(=O)[C@@H](N)C(C)C', 'COC(=O)c1ccc(F)c([SH](=O)=O)c1', 'COC=O', 'COC(=O)[C@@H](NS(=O)(=O)c1ccccc1F)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.