1 Data advise that this team of analogues can have potency just like or increased than fentan.2 Current in vitro data recommend that protonitazene is more potent than fentan.three Protonitazene isn't explicitly scheduled in The us; nonetheless, etonitazen and iso are Timetable I substances. Protonitazene and iso are isomeric analogues, https://authenticchemicals.com/