Using NC(=O)C(=O)O, c1ccc2c(c1)NC[C@H]2CCN1CCN(c2ccc3[nH]ccc3c2)CC1 to produce NC(=O)C(=O)N1C[C@@H](CCN2CCN(c3ccc4[nH]ccc4c3)CC2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.