Using OC(c1cccc(-c2ccccc2)n1)c1cccc(-c2ccccc2)n1 to produce O=C(c1cccc(-c2ccccc2)n1)c1cccc(-c2ccccc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.