Using OC(c1cn(C(c2ccccc2)(c2ccccc2)c2ccccc2)cn1)c1cccnc1F to produce O=C(c1cn(C(c2ccccc2)(c2ccccc2)c2ccccc2)cn1)c1cccnc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.