Using CCCCCN(CCCCC)C(=O)[C@@H]1CCN(C(=O)N(c2ccccc2)c2ccccc2)[C@@H](C(=O)NCCN(CC(N)=O)C(=O)OCc2ccccc2)C1 to produce CCCCCN(CCCCC)C(=O)[C@@H]1CCN(C(=O)N(c2ccccc2)c2ccccc2)[C@@H](C(=O)NCCNCC(N)=O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.