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Mass spectra of delta-8-THC (top) and delta-9-THC (bottom) to show that only the delta-8 isomer undergoes the retro-Diels–Alder rearrangement (j) to form the fragment at m/z 246. Adapted with permission from refs (22) and (87). Copyright 1965 Elsevier and 1987 Wiley Periodicals, Inc., respectively.
