Using C=C[Sn](CCCC)(CCCC)CCCC, CCOC(=O)C[C@@H]1CCc2cc(OCCc3nc(-c4cccc(Br)c4)oc3C)ccc21 to produce C=Cc1cccc(-c2nc(CCOc3ccc4c(c3)CC[C@H]4CC(=O)OCC)c(C)o2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.