Using COC(Cn1cc(Br)c(=O)c(OCc2ccccc2)c1C(=O)NCc1cccc(Cl)c1)OC, C=CC[Sn](CCCC)(CCCC)CCCC to produce C=C(C)c1cn(CC(OC)OC)c(C(=O)NCc2cccc(Cl)c2)c(OCc2ccccc2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.