Displaying 1 results of Methoxymorphinan Stable Isotopes Methoxymorphinan stable isotopes are isotopically labeled versions of the opioid analgesic drug methoxymorphinan. These isotopes have the same chemical properties as the non-labeled drug, but contain a specific number of stable isotopes, which can be used in research and analytical applications. Methoxymorphinan stable isotopes are often used in drug metabolism studies, drug development, and pharmacokinetic studies.