Using COC(=O)Cc1cc(Br)ccc1OCc1ccc(OCc2nc(-c3ccccc3)oc2C)cc1, C[Sn](C)(C)C to produce COC(=O)Cc1cc(C)ccc1OCc1ccc(OCc2nc(-c3ccccc3)oc2C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.