Using CC[C@@H]1CO[C@H](C(=O)O)CN1C(=O)OC(C)(C)C, NC1CCCCC1 to produce CC[C@@H]1CO[C@H](C(=O)NC2CCCCC2)CN1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.