Using CCCCCBr, CCCCO[C@@H]1[C@@H](C(O)=[SnH2])O[C@@H](n2ccc(=O)[nH]c2=O)[C@@]1(O)CCCC to produce CCCCCO[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1n1ccc(=O)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.