Using c1ccc(COCCC[P+](c2ccccc2)(c2ccccc2)c2ccccc2)cc1, O=Cc1cc(Br)ccc1O to produce Oc1ccc(Br)cc1C=CCCOCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.