Using CC(C)(C)c1cc2c(Cl)ncnc2o1, CC(C)(C)c1cc(N)c(C(N)=O)[se]1 to produce CC(C)(C)c1cc2c(Nc3cc(C(C)(C)C)[se]c3C(N)=O)ncnc2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.