Using C=C(OCC)[Sn](CCCC)(CCCC)CCCC, C[C@H](NC(=O)OC(C)(C)C)c1ccc(Br)cc1 to produce CC(=O)c1ccc([C@H](C)NC(=O)OC(C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.