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The ultraviolet (UV) degradation products of photochromic naphthoxazine and naphthopyran derivatives in acetonitrile were separated and identified using liquid chromatography-mass spectrometry (LC-MS). Photodegradation resulted in oxidation of products.doi:10.5478/msl.2012.3.4.101 fatcat:evay2frcg5h4jb6zk2sd7jhsei