Using C[C@@H](O)[C@@H](NC(=O)OCCCCCc1ccccc1)C(=O)O to produce C[C@H]1OC(=O)[C@@H]1NC(=O)OCCCCCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.