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