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We demonstrate here unambiguously that (E)-urocanic acid, an epidermal and photobiologically important chromophore, undergoes isomerization to the (Z) isomer upon excitation with UVA (320–400 nm) light using monochromatic 355 and 340 nm laser radiation. Additionally, chemical evidence is presented that supports the isomerization coming from the excited singlet state, thus proving unequivocally that...
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