Using O=Cc1ccc(-c2nc3ccc(Br)cn3c2-c2ccccc2)cc1 to produce OCc1ccc(-c2nc3ccc(Br)cn3c2-c2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.