5,6-Diamino-1,3-dimethyluracil → 1H-Purine-2,6-dione, 3,7-dihydro-1,3-dimethyl-8-(2-(2,3,4-trimethoxyphenyl)ethenyl)-, (E)-

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Substantially the same procedure as in Reference Example 70 was repeated using 5.00 g (29.4 mmol) of 5,6-diamino-1,3-dimethyluracil and 7.71 g (32.4 mmol) of 2,3,4-trimethoxycinnamic acid. Then, the resultant crude crystals were recrystallized from 2-propanol/water to give 3.78 g (yield 35%) of Compound 91 as an ocher powder.

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