Carfentanil Is an extremely potent fentanyl-derivative in the beginning circulated in the mid-eighties like a normal anesthetic for big animals for example elephants. Now, carfentanil nevertheless sees medical and scientific use being a radiotracer for positron emission tomography imaging, connected to its high affinity for MORs in brain tissue [fourteen]. https://chemicalglobe.com/product-tag/protonitazene-for-sale/