Using O=C(OCc1ccccc1)[C@@H]1C[C@@H]2CCCC[C@@H]2N1, C[C@H](NC(=O)OC(C)(C)C)C(=O)O to produce C[C@H](NC(=O)OC(C)(C)C)C(=O)N1[C@H](C(=O)OCc2ccccc2)C[C@@H]2CCCC[C@@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.