Using O=C(Cl)c1cccc2c(Br)cccc12, COC(=N)Cc1cccc2ccccc12 to produce COC(Cc1cccc2ccccc12)=NC(=O)c1cccc2c(Br)cccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.