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The structure and stereochemistry of thymine dimer, obtained by ultraviolet irradiation of a frozen, aqueous solution of thymine, is determined by its transformation into an isomer shown to be a derivative of 3,5,9-triazatricyclo-[5,3,0,02,6]decane of cis-syn-cis configuration.
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Blackburn et al. (1966) studied this question.
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