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In a photochemical chamber, a sample of 27.9 mM indomethacin (IN) in methanol was exposed to a Philips 400-W UV lamp for 5 days in normal atmosphere. Four photoproducts were separated using high-performance liquid chromatography, and their structures were elucidated by various spectroscopic methods, including liquid chromatography–electrospray ionization–mass spectrometry. A reaction scheme of IN...
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