Using O=Cc1ccccc1Cl, Nc1nc(N2CCCNCC2)nc2nc(-c3ccco3)nn12 to produce Nc1nc(N2CCCN(Cc3ccccc3Cl)CC2)nc2nc(-c3ccco3)nn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.