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Formula | C23H35NO2 |
Molar mass | 357.538 g·mol−1 |
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Tonazocine (WIN-42,156) is an opioid analgesic of the benzomorphan family which made it to phase II clinical trials for the treatment of postoperative pain,[1] but development was apparently ceased and ultimately it was never marketed. Tonazocine is a partial agonist at both the mu-opioid and delta-opioid receptors, but acting more like an antagonist at the former and more like an agonist at the latter.[2][3] It lacks most of the side effects of other opioids such as adverse effects on the cardiovascular system and respiratory depression, but it can cause sedation (although to a lesser degree of typical opioids), and in some patients it may induce hallucinations (probably via binding to and activating the κ-opioid receptor).[4]