Using CCCC[Sn](CCCC)(CCCC)c1sccc1P(=O)(OCC)OCC, CCOP(=O)(OCC)c1csc(I)c1 to produce CCOP(=O)(OCC)c1csc(-c2sccc2P(=O)(OCC)OCC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.