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 Effects of xanthine derivatives on cerebral metabolism, 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, Recommanded Product: 1028-33-7.
In rats made hypoxic by exposure to simulated high altitude, the brain was studied electroencephalog. as a model of clin. brain senescence. Contrary to theophylline [58-55-9] and theobromine [83-67-0], 1-hexyl-3,7-dimethylxanthine (I) [1028-33-7] improved the brain nutritional state during hypoxia when injected (25 mg/kg) 20 min prior to exposure. This was due to an increased supply of glucose [50-99-7] to the brain, apparently as a consequence of a direct stimulatory action of I on glucose transport across the blood-brain barrier.
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Reference:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem