[Perfection of the method of purification of 3-methylxanthine in the synthesis of theobromine].
D002626:Chemistry, Pharmaceutical; D013805:Theobromine / Q000138:chemical synthesis*; D014970:Xanthines
D014970:Xanthines; D013805:Theobromine
Usovershenstvovanie sposoba ochistki 3-metilksantina v sinteze teobromina.