Using O=CCc1ccc(Br)cc1, CCOC(=O)C=P(c1ccccc1)(c1ccccc1)c1ccccc1 to produce CCOC(=O)C=CCc1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.