Using CSc1nc2ncnc(Cl)c2s1, CC(C)(C)c1cc(N)c(C(N)=O)[se]1 to produce CSc1nc2ncnc(Nc3cc(C(C)(C)C)[se]c3C(N)=O)c2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.