Using OCc1cc(OCc2ccccc2)c(OCc2ccccc2)c(OCc2ccccc2)c1 to produce O=Cc1cc(OCc2ccccc2)c(OCc2ccccc2)c(OCc2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.