Using O=C(Cn1c(-c2ccccc2)c(Cl)nc(Cl)c1=O)OCc1ccccc1, CC[Sn](CC)(CC)CC to produce CCc1nc(Cl)c(-c2ccccc2)n(CC(=O)OCc2ccccc2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.