Using CC(=O)OC(C)=O, CCn1c(=N)c(-c2c(Cl)cccc2Br)cc2cnc(Nc3ccccc3)nc21 to produce CCn1c(=O)c(-c2c(Cl)cccc2Br)cc2cnc(Nc3ccccc3)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.