In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Absorption, distribution, excretion, and degradation of 1-hexyl-3,7-dimethylxanthine, published in 1966, which mentions a compound: 1028-33-7, mainly applied to DIMETHYLXANTHINES METAB; METAB DIMETHYLXANTHINES; XANTHINES METAB; URINE METABOLITES DIMETHYLXANTHINES, Formula: C13H20N4O2.
1-Hexyl-3,7-dimethylxanthine, administered orally or rectally to rabbits, was rapidly absorbed and persisted in the blood, liver, brain, myocardium, and skeletal muscles for several hrs. Less than 1% of the administered dose was excreted without undergoing chem. transformation. Following prolonged oral administration of 1-hexyl-3,7-dimethylxanthine (500 mg./day), 50% of the administered dose was excreted in the urine in 24 hrs. as metabolities formed by oxidation of the hexyl radical side chain. A small fraction of 1-hexyl-3,7-dimethylaxanthine metabolites was excreted in the feces, after enterohepatic circulation. Urinary metabolites identified included 1-(5′-hydroxyhexyl)-3,7-dimethyl-xanthine, 1-(5′-ketohexyl)-3,7-dimethylxanthine, 1-(4′,5′-dihydroxyhexyl)-3,7-dimethylxanthine, and 1-(3′-carboxypropyl)-3,7-dimethylxanthine. 60 references.
Although many compounds look similar to this compound(1028-33-7)Formula: C13H20N4O2, numerous studies have shown that this compound(SMILES:CN1C=NC(N(C(N2CCCCCC)=O)C)=C1C2=O), has unique advantages. If you want to know more about similar compounds, you can read my other articles.
Reference:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem