LITTLE ROCK, Ark. (KARK/KLRT) — Authorities and health officials in Arkansas are warning of a powerful new synthetic opioid that has been linked to a recent death in the state. The drug, known as cychlorphine, is about 10 times more potent than fentanyl, Dr. Theodore Brown, the Arkansas State Crime Laboratory Director and Chief Medical Examiner, told Nexstar’s KLRT.