Using COc1ccc(C(C)=O)cc1, O=C(O)C(SCc1ccccc1)C(=O)O to produce COc1ccc(-c2cc(O)c(SCc3ccccc3)c(=O)o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.