3-(4-Phenylphenyl)prop-2-enoic acid → 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(1,1'-biphenyl)-4-ylethenyl)-1,3-diethyl-, (E)-

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Substantially the same procedure as in Example 7 was repeated using 2.50 g (12.6 mmol) of 5,6-diamino-1,3-diethyluracil and 3.12 g (13.9 mmol) of 4-phenylcinnamic acid. Then, the resultant crude crystals were recrystallized from dioxane/water to give 1.90 g (yield 39%) of Compound 163 as yellow flocculent precipitates.

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