Using COc1ccc(C(=O)C2=CCCCc3c2cc(OC)c(OC)c3OC)cc1OC(C)C to produce COc1ccc(C(=O)C2=CCCCc3c2cc(OC)c(OC)c3OC)cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.