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| Formula | C22H25FN4O3 | 
| Molar mass | 412.465 g·mol−1 | 
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Fluetonitazepyne (F-etonitazepyne, 2-fluoroetonitazepyne) is a benzimidazole derivative which is an opioid designer drug. It was first identified in Italy in July 2024, [1] and subsequently isolated in Finland in early 2025 from the body fluids of five people who had died from opioid overdose. [2]