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 Some aspects of the pharmacological activity of a new theophyllinic: 1-hexyl-3,7-dimethylxanthine (SK-7), published in 1960, which mentions a compound: 1028-33-7, Name is 1-Hexyl-3,7-dimethyl-1H-purine-2,6(3H,7H)-dione, Molecular C13H20N4O2, Recommanded Product: 1028-33-7.
The vascular action of theophylline (I) and its derivatives and the lipotropic and antieholesterol (II) activity of I have been investigated. SK-7 reduced the amplitude of the cardiogram of isolated rabbit hearts to an extent roughly proportional to the dosage, but the effect was brief; only a dose of 500 γ of SK-7, after a brief period of inhibition, succeeded in restoring the amplitude of the tracing to a level slightly superior to that of the normal. While a dose of SK-7 of 1 mg./kg. body weight only slightly affected the arterial pressure of anesthetized dogs, a dose of 10 mg./kg. was definitely hypotensive, with a vasodilatory effect on the cerebral circulation. SK-7 increased the capacity of the vessels in the posterior portions of the rabbit and protected the rat against both gangrene in the tail and cyanosis. A protective influence of SK-7 against hyperlipide and hyper-II steatosis in the liver of rats has been demonstrated. Contrary to other derivatives of I, SK-7 has almost no effect on cardiac or coronary activity, and has a strong cerebral vasodilatory action. Its hypotensive and peripheral vasodilatory activities were typical of many xanthine compounds
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Reference:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem