Using COc1ccc(CC(O)(c2ccc(OC)cc2)c2ccc(OC)cc2)cc1 to produce COc1ccc(C=C(c2ccc(OC)cc2)c2ccc(OC)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.