Using COCCBr, CC1(C)C(C(=O)Nc2nc3ccc(F)cc3s2)C1(C)C to produce COCCn1c(=NC(=O)C2C(C)(C)C2(C)C)sc2cc(F)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.