Using O=C(c1ccccc1)c1ccc(Nc2nccc(-c3cnc4ccccn34)n2)cc1 to produce OC(c1ccccc1)c1ccc(Nc2nccc(-c3cnc4ccccn34)n2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.