Carfentanil Is an extremely strong fentanyl-derivative originally circulated inside the mid-eighties to be a common anesthetic for giant animals which include elephants. At the moment, carfentanil nonetheless sees medical and scientific use like a radiotracer for positron emission tomography imaging, relevant to its large affinity for MORs in brain tissue https://chemicalglobe.com/shop/uncategorized/protonitazene-for-sale/