3-(3-Bromophenyl)acrylic acid → 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(3-bromophenyl)ethenyl)-1,3-diethyl-, (E)-

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Substantially the same procedure as in Reference Example 70 was repeated using 2.0 g (10.1 mmol) of 5,6-diamino-1,3-diethyluracil and 2.52 g (11.1 mmol) of 3-bromocinnamic acid. Then, the resultant crude crystals were recrystallized from tetrahydrofuran/water to give 2.01 g (yield 37%) of Compound 161 as pale green plates.

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