Etocyanozene
Etocyanozene is a benzimidazole opioid 'desnitazene' derivative with opioid effects. It was first developed in the 1950s as part of the research that led to better-known compounds such as etonitazene. It is an analogue of etonitazene where the 5-nitro group has been replaced by a nitrile group. It is described as having "reduced but still significant" potency compared to etonitazene itself. It was made illegal in Germany in July 2021.