thebaine

n. alkaloid used in medicine

Thebaine (paramorphine) is an opiate alkaloid. A minor constituent of opium, thebaine is chemically similar to both morphine and codeine, but has stimulatory rather than depressant effects, causing strychnine-like convulsions at higher doses. Thebaine is not used therapeutically, but can be converted industrially into a variety of compounds including oxycodone, oxymorphone, nalbuphine, naloxone, naltrexone, buprenorphine and etorphine.
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Thebaine /the·baine/ a crystalline, poisonous, and anodyne alkaloid from opium, having properties similar to those of strychnine. the·ba·ine n. [more]Thebaine - Community and Resources

n. thebaine, alkaloid used in medicine

(n.)
A poisonous alkaloid, C19H21NO3, found in opium in small quantities, having a sharp, astringent taste, and a tetanic action resembling that of strychnine.