Using C=C(C)Cc1c(O)c(Cl)cc(F)c1-n1c(=O)cc(C(F)(F)F)n(C)c1=O, COC(=O)CBr to produce C=C(C)Cc1c(OCC(=O)OC)c(Cl)cc(F)c1-n1c(=O)cc(C(F)(F)F)n(C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.