Using C=C1CN(C(=O)OC(C)(C)C)C1, CC1C(=O)NN=C2COc3ccc(Br)cc3N21 to produce CC1C(=O)NN=C2COc3ccc(C=C4CN(C(=O)OC(C)(C)C)C4)cc3N21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.