Using CCCC[Sn](Cl)(CCCC)CCCC, O=C(N[C@@H](Cc1ccc(Cl)cc1)C(=O)O)OCc1ccccc1 to produce CCCC[Sn](CCCC)(CCCC)c1ccc(C[C@H](NC(=O)OCc2ccccc2)C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.