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The photoproducts formed on ultraviolet irradiation of the sunscreen absorber trans-2-ethylhexyl-p-methoxycinnamate, were separated and characterised using a new combined technique, capillary supercritical fluid chromatography-atmospheric pressure chemical ionisation mass spectrometry. Using this technique the commercially available trans-isomer was found to photoisomerise on irradiation at wavelengths...
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