Using Cc1c(C)c(OCc2ccccc2)c(CCCCO)c(C)c1OCc1ccccc1 to produce Cc1c(C)c(OCc2ccccc2)c(CCCC=O)c(C)c1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.