Using C#CCO, O=C(c1ccc(-n2cc(-c3n[nH]c4cc(Br)ccc34)nn2)cc1)N1CCOCC1 to produce O=C(c1ccc(-n2cc(-c3n[nH]c4cc(C#CCO)ccc34)nn2)cc1)N1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.