5,6-Diamino-1,3-dipropyl-2,4(1H,3H)-pyrimidinedione → 1H-Purine-2,6-dione, 3,7-dihydro-1,3-dipropyl-8-(2-(4-methoxy-2,5-dimethylphenyl)ethenyl)-, (E)-

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Substantially the same procedure as in Reference Example 1 was repeated using 2.5 g (11.1 mmol) of 5,6-diamino-1,3-dipropyluracil and 2.51 g (12.17 mmol) of 4-methoxy-2,5-dimethylcinnamic acid. Then, the resultant crude crystals were recrystallized from ethanol/water to give 1.98 g (yield 45%) of Compound 44 as white crystals.

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