Using CCOC(=O)c1nc(Br)c2nc(-c3ccccc3)sc2c1O, C=C(C)C[Sn](CCCC)(CCCC)CCCC to produce C=C(C)Cc1nc(C(=O)OCC)c(O)c2sc(-c3ccccc3)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.