Using O=Cc1ccc(Br)cc1OC(F)(F)F, CCOC(=O)CP(=O)(COC)OCC to produce CCOC(=O)/C=C/c1ccc(Br)cc1OC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.