Using O=C(O)C(SCCc1ccccc1)C(=O)O, CC(=O)c1ccc(OCc2ccccc2)cc1 to produce O=c1oc(-c2ccc(OCc3ccccc3)cc2)cc(O)c1SCCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.