Using CN, CSc1ncc2cc(-c3cc(NC(=O)NCCC(C)(C)C)c(F)cc3Br)c(C)nc2n1 to produce CNc1ncc2cc(-c3cc(NC(=O)NCCC(C)(C)C)c(F)cc3Br)c(C)nc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.