Using CC(C)(C)OC(=O)N[C@H](C=O)COCc1ccccc1, CC(C)(C)OC(=O)N[C@@H](CN)COCc1ccccc1 to produce CC(C)(C)OC(=O)NC(CNC[C@@H](COCc1ccccc1)NC(=O)OC(C)(C)C)COCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.