Using COc1ccccc1-c1ccc(Cc2c(C)c(OC)c(OC)c(OC)c2OC)cc1C(=O)O to produce COC1=C(OC)C(=O)C(Cc2ccc(-c3ccccc3OC)c(C(=O)O)c2)=C(C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.