Using CCCCC1(CCCC)CCc2c(OCc3ccc4ccccc4n3)cccc2C1=O to produce CCCCC1(CCCC)CCc2c(OCc3ccc4ccccc4n3)cccc2C1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.