Carfentanil Is an especially powerful fentanyl-derivative initially circulated from the mid-eighties as a common anesthetic for giant animals including elephants. At present, carfentanil continue to sees medical and scientific use as being a radiotracer for positron emission tomography imaging, connected to its superior affinity for MORs in Mind tissue [14]. https://chemicalglobe.com/shop/uncategorized/protonitazene-for-sale/