Using CCOC(=O)c1cnc(Cl)o1, C[Sn](C)(C)c1cc(Cl)cc2c1cnn2S(=O)(=O)c1ccccc1 to produce CCOC(=O)c1cnc(-c2cc(Cl)cc3c2cnn3S(=O)(=O)c2ccccc2)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.