Using Cc1ccc(-c2nc3c(-c4ccccc4)n[nH]c3c(=O)n2-c2ccc(Br)cc2)cc1, O=C([O-])[O-] to produce Cc1ccc(-c2nc3c(-c4ccccc4)nn(C)c3c(=O)n2-c2ccc(Br)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.