Using CCOC(=O)c1nn(-c2ccc(Cl)cc2Cl)c(-c2ccc(Br)[se]2)c1C to produce Cc1c(C(=O)O)nn(-c2ccc(Cl)cc2Cl)c1-c1ccc(Br)[se]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.