Using CCCCCCCCCCC[C@H](CC(=O)OC)OC(=O)C(Br)CCCCCC to produce CCCCCCCCCCC[C@@H]1CC(O)=C(CCCCCC)C(=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.