Using C#CCO, O=C(c1cccnc1Oc1cc(Cl)c(Br)cc1Cl)N1CCN(C2CC2)c2ccccc21 to produce O=C(c1cccnc1Oc1cc(Cl)c(C#CCO)cc1Cl)N1CCN(C2CC2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.