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|Section2= |Section3= }} Morphinan is the prototype chemical structure of a large chemical class of psychoactive drugs, consisting of opiate analgesics, cough suppressants, and dissociative hallucinogens, among others. == Structure == Morphinan has a phenanthrene core structure with the ''A'' ring remaining aromatic and the ''B'' and ''C'' rings being saturated, and an additional nitrogen-containing, six-membered, saturated ring, the ''D'' ring, being attached to carbons 9 and 13 of the core, and with the nitrogen at position 17 of the composite. Of the major naturally-occurring opiates of the morphinan type—morphine, codeine and thebaine—thebaine has no therapeutic properties (it causes seizures in humans), but it provides a low-cost feedstock for the synthesis of at least four semi-synthetic opiates, including hydrocodone, hydromorphone, oxycodone and oxymorphone, and, perhaps more significantly, the opioid antagonist naloxone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「morphinan」の詳細全文を読む スポンサード リンク
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