Using COc1ccc2c(c1)C(O)C(c1nccn1C)C(CCc1ccccc1)O2 to produce COc1ccc2c(c1)C=C(c1nccn1C)C(CCc1ccccc1)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.