Easy Ordering Process, Fast Worldwide Shipping. Carfentanil or (also known as 4-carbomethoxyfentanyl) is an analog of the synthetic analgesic . It was found to be four orders of magnitude or 10,000 times more potent than , making it one of the most potent known and the most potent commercially used opioids Name: Ohmefentanyl Purity: 99.9 % A++ Form: Crystal Powder - Straight from the brick! Minimum Order.