Detection and confirmation of the ring-opened carboxylic acid metabolite of a new synthetic opioid furanylfentanyl Posted on February 23, 2022February 23, 2022 By Becky Carter Tatsuyuki Kanamori, Yuki Okada, Hiroki Segawa, Tadashi Yamamuro, Kenji Kuwayama, Kenji Tsujikawa & Yuko Togawa-Iwata Forensic Toxicology; 39; 2021 Access article Chemistry, Crime Scene Investigation and Reconstruction, Seized Drugs/Controlled Substances, Toxicology