Carfentanil Is a particularly powerful fentanyl-by-product initially circulated during the mid-eighties to be a basic anesthetic for giant animals such as elephants. At present, carfentanil nevertheless sees health care and scientific use for a radiotracer for positron emission tomography imaging, connected with its higher affinity for MORs in brain tissue https://chemicalglobe.com/shop/uncategorized/protonitazene-for-sale/