Using O=C(Cl)CCCBr, COC(=O)c1c(C(F)F)nc(C(F)(F)F)c(CC#N)c1CC1CC1 to produce COC(=O)c1c(C(F)F)nc(C(F)(F)F)c(C(C#N)=C2CCCO2)c1CC1CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.