Using CC(C)N1CCCC[C@H]1C(=O)O, COC(=O)[C@@H]1C[C@@]2(CN1C(=O)[C@@H](NC(=O)[C@@H](N)C1CCCCC1)C(C)(C)C)C(C)(C)C21CCC1 to produce COC(=O)[C@@H]1C[C@@]2(CN1C(=O)[C@@H](NC(=O)[C@@H](NC(=O)[C@@H]1CCCCN1C(C)C)C1CCCCC1)C(C)(C)C)C(C)(C)C21CCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.