Using CCOC(=O)C1=Cc2ccc(Br)cc2N=C(NC(=O)OC(C)(C)C)C1 to produce CC(C)(C)OC(=O)NC1=Nc2cc(Br)ccc2C=C(C(=O)O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.