Using CCCCCOc1ccc(Cn2c(C)nc(Br)c2C=O)c(Cl)c1, C=C[Sn](CCCC)(CCCC)CCCC to produce C=Cc1nc(C)n(Cc2ccc(OCCCCC)cc2Cl)c1C=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.