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Photodegradation of nalidixic and tiaprofenic acids and nifedipine in aerobic conditions.

Since nalidixic acid had been previously studied in acidic and basic media, nifedipine had been investigated in anaerobic conditions and under ultraviolet light and tiaprofenic acid had not been studied at all, their photodegradation was carried out in this laboratory under milder conditions, with methanol as the solvent and using visible light. The role of oxygen was demonstrated and the photoproducts were isolated and identified spectroscopically.