Using CC#CCBr, Cn1c(=O)c2[nH]cnc2n(COC(=O)C(C)(C)C)c1=O to produce CC#CCn1cnc2c1c(=O)n(C)c(=O)n2COC(=O)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.