Using CCCCCCCC(=O)N1CCN(C(=O)CCCCCCC)CCN(C(=O)CCCCCCC)CC1 to produce CCCCCCCCN1CCN(CCCCCCCC)CCN(CCCCCCCC)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.