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