Using O=C(Nc1ccc(Cl)cc1)c1cccnc1NCC1CCN(c2ccncc2)CC1 to produce Clc1ccc(NCc2cccnc2NCC2CCN(c3ccncc3)CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.