Using COc1ccc2c(c1)C(O)(c1ccccc1)OC21CCN(Cc2ccccc2)CC1, CO to produce COc1ccc2c(c1)C(OC)(c1ccccc1)OC21CCN(Cc2ccccc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.