Using CCOC(=O)COc1ccc(C[P+](c2ccccc2)(c2ccccc2)c2ccccc2)cc1C, O=Cc1cccc(Br)c1 to produce CCOC(=O)COc1ccc(C=Cc2cccc(Br)c2)cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.