5,6-Diamino-1,3-diethyluracil → 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(2,3-dimethyl-4-methoxy)phenyl)ethenyl)-, (E)-

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Substantially the same procedure as in Reference Example 70 was repeated using 2.5 g (12.6 mmol) of 5,6-diamino-1,3-diethyluracil and 2.9 g (13.9 mmol) of 4-methoxy-2,3-dimethylcinnamic acid. Then, the resultant crude crystals were recrystallized from ethanol/water to give 0.80 g (yield 17%) of Compound 81 as white crystals.

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