Using COc1ccc2[nH]c(C)c(CCO)c2c1C(=O)c1ccc(Cl)cc1 to produce COc1ccc2[nH]c(C)c(CC=O)c2c1C(=O)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.