Using COc1c(C)c(C)c(OC)c2c(C)c(Sc3ccccc3)oc12 to produce CC1=C(C)C(=O)c2c(oc(Sc3ccccc3)c2C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.