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

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Substantially the same procedure as in Example 7 was repeated using 2.50 g (14.7 mmol) of 5,6-diamino-1,3-dimethyluracil and 3.37 g (16.2 mmol) of 2,3-dimethoxycinnamic acid. Then, the resultant crude crystals were recrystallized from ethanol/water to give 1.03 g (yield of Compound 88 as pale yellow needles.

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