Using CS(=O)(=O)Oc1ccc(-c2c3ccccc3c(I)c3sc4ccccc4c23)cc1, C[Sn](C)(C)C to produce Cc1c2ccccc2c(-c2ccc(OS(C)(=O)=O)cc2)c2c1sc1ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.