Opioids

Question 1

Naturally occurring opioids

Answer 1

phenanthrenes (morphine and codeine)

benzylisoquinolines (papaverine)

Thebaine

Question 2

Semisynthetic opioids

Answer 2

Heroin

Dihydromorphone, morphinone

Thebaine derivatives (e.g., etorphine, buprenorphine)

Question 3

Synthetic opioids

Answer 3

Morphinan derivatives (e.g., levorphanol, butorphanol)

Diphenylpropylamine derivatives (e.g., methadone)

Benzomorphan derivatives (e.g., pentazocine)

Phenylpiperidine derivatives (e.g., meperidine, fentanyl, sufentanil,
alfentanil, remifentanil)