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Top: 1H NMR spectrum of the crude of 3e in DMSO-d6 solution freshly prepared; bottom: 1H NMR spectrum of the crude of 3e in DMSO-d6 solution after a week in the NMR tube (both at 400 MHz). The signals in the 4.5–5.0 ppm region and a doublet in the 5.5–6.0 region are not indazole derivatives but most probably formaldehyde short polymers.
