Using CC(C)(C)OC(=O)N1CCC[C@@H]1COc1cnc(Cl)c(Br)c1, C=CC[Sn](CCCC)(CCCC)CCCC to produce C=CCc1cc(OC[C@H]2CCCN2C(=O)OC(C)(C)C)cnc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.