English Cyclopentylfentanyl Cited by user Meodipt on 10 Nov 2017 Cyclopentylfentanyl is an opioid analgesic that is an analog of fentanyl and has been sold online as a designer drug, mainly in Sweden and other Scandinavian countries.
English List of fentanyl analogues Cited by user Meodipt on 26 Sep 2017 This is a list of fentanyl analogues, many of which have been sold as designer drugs.