Using O, CCCCC[C@@H](/C=C/[C@@H]1[C@H]2CC(C(Br)CCCC(=O)OC)O[C@H]2C[C@H]1OC1CCCCO1)OC1CCCCO1 to produce CCCCC[C@@H](/C=C/[C@@H]1[C@@H](CC(=O)CCCCC(=O)OC)[C@@H](O)C[C@H]1OC1CCCCO1)OC1CCCCO1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.