Using O=C(CC[C@H](NC(=O)OCc1ccccc1)C(=O)O)OCc1ccccc1, CC(C)[C@H](N)C(=O)N[C@H](C(=O)OC(C)(C)C)[C@@H](C)OC(C)(C)C to produce CC(C)[C@H](NC(=O)[C@H](CCC(=O)OCc1ccccc1)NC(=O)OCc1ccccc1)C(=O)N[C@H](C(=O)OC(C)(C)C)[C@@H](C)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.