Using Brc1ncn(-c2ccc(Nc3nccc(-c4cccc(N5CCOCC5)c4)n3)cc2)n1, C=C[Sn](CCCC)(CCCC)CCCC to produce C=Cc1ncn(-c2ccc(Nc3nccc(-c4cccc(N5CCOCC5)c4)n3)cc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.