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1H NMR spectra of 1 in various states of decomposition. (A) 1H NMR spectrum of 5 mg of 1 in DMSO-d6 after 72 h in the dark. (B) 1H NMR spectrum of 5 mg of 1 in DMSO-d6 after 72 h in the light (benchtop indoors), showing decomposition. (C) 1H NMR spectrum of 25 mg of 1 in DMSO-d6 after 72 h in the light (benchtop indoors), showing decomposition. (D) 1H NMR spectrum of 5 mg of 1 in CDCl3 after 120 h in the light (benchtop indoors).
