Using COCOc1ccc(-c2csc(CCC(=O)O)c2-c2ccc(Cl)cc2OC)cc1 to produce COc1cc(Cl)ccc1-c1c(-c2ccc(O)cc2)csc1CCC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.