In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Mechanism of the antagonistic action of xanthine derivatives against adenosine and coronary vasodilators, published in 1972, which mentions a compound: 1028-33-7, Name is 1-Hexyl-3,7-dimethyl-1H-purine-2,6(3H,7H)-dione, Molecular C13H20N4O2, SDS of cas: 1028-33-7.
The coronary dilating activity of adenosine (I) [58-61-7], dipyridamole (II) [58-32-2], and lidoflazine (III) [3416-26-0] in anesthetized dogs was inhibited by 1-substituted xanthines, e.g. caffeine (IV) [58-08-2] or theophylline (V) [58-55-9], provided the substituent was small and no substituent was present at the 7 position. The enhancement of the coronary dilating activity of I by II and III was not inhibited by IV or V. The suppression of I permeation through erythrocyte membranes caused by II or III was not reversed by V. The coronary vasodilation induced by carbocromene [804-10-4], which did not suppress the I permeation through erythrocyte membranes, was not influenced by IV or V, indicating a different mode of action.
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Reference:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem