Using COC(=O)COc1ccc(S)c2c1CCC2, O=C(CCCCl)c1ccc(Cl)cc1 to produce COC(=O)COc1ccc(SCCCC(=O)c2ccc(Cl)cc2)c2c1CCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.