Using Fc1ccc(Nc2nc(Cl)nc3c(Cl)nc(Cl)nc23)cc1Cl to produce Fc1ccc(Nc2nc(Cl)nc3c2N=C(Cl)NC3)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.