Using C=CCC(C)(C)COC(=O)N[C@H](C(=O)N1C[C@H](Oc2nc3cc(C#N)ccc3c3cc(OC)c(Br)cc23)C[C@H]1C(=O)OC)C1CCCC1, C=C[Sn](CCCC)(CCCC)CCCC to produce C=CCC(C)(C)COC(=O)N[C@H](C(=O)N1C[C@H](Oc2nc3cc(C#N)ccc3c3cc(OC)c(C=C)cc23)C[C@H]1C(=O)OC)C1CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.