Etonitazepipne
Etonitazepipne (N-piperidino etonitazene) is a benzimidazole derivative with opioid effects around 100 times more potent than morphine, which has been sold over the internet as a designer drug. See also 
 Etazene
 Etonitazepyne
 Isotonitazene
 Metonitazene
 Protonitazepyne
 List of benzimidazole opioids

References 

Analgesics
Designer drugs
Benzimidazole opioids
Nitro compounds
1-Piperidinyl compounds
Aromatic ethers