Using CCOC(=O)C(N)Cc1c[nH]c2c(C(N)=O)ccc(Br)c12, C=O to produce CCOC(=O)C1Cc2c([nH]c3c(C(N)=O)ccc(Br)c23)CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.