3-(1,3-Benzodioxol-5-yl)prop-2-enoic acid → 1H-Purine-2,6-dione, 8-((1E)-2-(1,3-benzodioxol-5-yl)ethenyl)-3,7-dihydro-1,3-dimethyl-

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Substantially the same procedure as in Example 7 was repeated using 5.0 g (29.4 mmol) of 5,6-diamino-1,3 -dimethyluracil and 6.78 g (35.3 mmol) of 3,4-methylenedioxycinnamic acid. Then, the resultant crude crystals were recrystallized from dimethylformamide/water to give 1.20 g (yield 13%) of Compound 86 as a pale yellow powder.

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