Using CCOC(=O)c1nc(Br)c2c(c1O)c1ccccc1n2C, N#C[Cu] to produce CCOC(=O)c1nc(C#N)c2c(c1O)c1ccccc1n2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.