The Characterization and Differentiation of 21 Fentanyl Analogues by Gas Chromatography/Mass Spectrometry (GC/MS), Liquid Chromatography/Mass Spectrometry (LC/MS), and Nuclear Magnetic Resonance (NMR) Spectroscopy

Kanamori, Tatsuyuki, Kashiwa JAPAN; Iwata, Yuko Togawa, Kashiwa JAPAN; Segawa, Hiroki, Kashiwa JAPAN; Yamamuro, Tadashi, Kashiwa JAPAN; Kuwayama, Kenji, Kashiwa JAPAN; Tsujikawa, Kenji, Kashiwa JAPAN; Inoue, Hiroyuki, Kashiwa JAPAN