Using C[C@]1(O)O[C@H](CBr)[C@](O)(OCc2ccccc2)[C@@](O)(OCc2ccccc2)[C@@]1(O)OCc1ccccc1 to produce C=C[C@](O)(OCc1ccccc1)[C@@](O)(OCc1ccccc1)[C@](O)(C=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.