MDA-19 is a drug that acts as a potent and selective agonist for the cannabinoid receptorCB2, with reasonable selectivity over the psychoactive CB1 receptor, though with some variation between species. In animal studies it was effective for the treatment of neuropathic pain, but failed to produce cannabis-like behavioural effects.
^Diaz P, et al. Design and synthesis of a novel series of N-alkyl isatin acylhydrazone derivatives that act as selective cannabinoid receptor 2 agonists for the treatment of neuropathic pain. Journal of Medicinal Chemistry. 2008 Aug 28;51(16):4932-47. PMID 18666769
^Xu JJ, et al. Pharmacological characterization of a novel cannabinoid ligand, MDA19, for treatment of neuropathic pain. Anesthesia and Analgesia. 2010 Jul;111(1):99-109. PMID 20522703