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

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Substantially the same procedure as in Example 7 was repeated using 2.0 g (10.1 mmol) of 5,6-diamino-1,3-diethyluracil and 2.33 g (12.1 mmol) of 3,4methylenedioxycinnamic acid. Then, the resultant crude crystals were recrystallized from dimethylformamide/water to give 1.34 g (yield 38%) of Compound 78 as a yellowish green powder.

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