Levonantradol (l-Nantradol) hydrochloride is an analog of delta (9)-tetrahydrocannabinol. Levonantradol acting as a potent anti-analgesic agent[1].
References
[1] Wolff JS 3rd, et, al. The effects of levonantradol hydrochloride on tumor growth and therapy. J Clin Pharmacol. 1981 Aug-Sep;21(S1):99S-102S. DOI:10.1002/j.1552-4604.1981.tb02582.x