Using O=C1N[C@@H]2CCCC[C@H]2N1C1CCN(C2CCNCC2)CC1, CCCC(=O)O to produce CCCC(=O)N1CCC(N2CCC(N3C(=O)N[C@@H]4CCCC[C@H]43)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.