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| Formula | C22H26N4O3 | 
| Molar mass | 394.475 g·mol−1 | 
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Ethyleneoxynitazene (Tetrahydrofuranitazene) is a benzimidazole derivative which has been sold as a designer drug over the internet and has opioid effects, though with lower potency than etonitazene itself [1] It is an analogue of etonitazene where the 4-ethoxy group attached to the benzyl ring has been cyclised round to the 3-position to form a 2,3-dihydrobenzofuran ring system. It was first reported in Estonia in February 2023, [2] subsequently in the UK in late 2023 [3] and in China July 1st. [4]
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