Using CCO, Clc1ccc(-c2c3ncnc(Cl)c3nn2-c2ccccc2Cl)cc1 to produce CCOc1ncnc2c(-c3ccc(Cl)cc3)n(-c3ccccc3Cl)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.