Using O=C(OCc1ccccc1)c1ccc(O)cc1, CC(C)(C)OC(=O)N1CC[C@@H](O)C1 to produce CC(C)(C)OC(=O)N1CC[C@H](Oc2ccc(C(=O)OCc3ccccc3)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.