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| Formula | C20H23FN4O2 | 
| Molar mass | 370.428 g·mol−1 | 
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Flunitazene (Fluonitazene) is a benzimidazole derivative with opioid effects, first developed in the 1950s as part of the research that led to better-known compounds such as etonitazene. It is one of the least potent derivatives from this class to have appeared as a designer drug, with only around the same potency as morphine, but nevertheless has been sold since around 2020, and has been linked to numerous drug overdose cases. [1] [2] [3] [4] [5] [6]