A summary of the most common chemical descriptors (InChI Key and SMILES codes) for Paraxanthine are summarized together with 3D and 2D structures and relevant physico-chemical properties.

What is the Paraxanthine?

The molecule Paraxanthine presents a molecular formula of C7H8N4O2 and its IUPAC name is 1,7-dimethyl-3H-purine-2,6-dione.

Paraxanthine is a naturally occurring purine alkaloid with the chemical formula C8H10N4O2. It belongs in coffee beans and tea leaves, and is also a metabolite of caffeine. Paraxanthine has a similar structure to caffeine, and is thought to contribute to the psychoactive effects of coffee. Paraxanthine is a central nervous system stimulant, and has been shown to have a range of other effects, including reducing inflammation and improving lipid metabolism..

3D structure

Cartesian coordinates

Geometry of Paraxanthine in x, y and z coordinates (Å units) to copy/paste elsewhere. Generated with Open Babel software.

2D drawing


Paraxanthine QUNWUDVFRNGTCO-UHFFFAOYSA-N chemical compound 2D structure molecule svg


Molecule descriptors

IUPAC name1,7-dimethyl-3H-purine-2,6-dione
InChI codeInChI=1S/C7H8N4O2/c1-10-3-8-5-4(10)6(12)11(2)7(13)9-5/h3H,1-2H3,(H,9,13)

Other names (synonyms)

IUPAC nomenclature provides a standardized method for naming chemical compounds. Although this system is widely used in chemistry, many chemical compounds have also other names commonly used in different contexts. These synonyms can come from a variety of sources and are used for a variety of purposes.

One common source of synonyms for chemical compounds is the common or trivial names, assigned on the basis of appearance, properties, or origin of the molecule.

Another source of synonyms are historical or obsolete names employed in the past, however replaced nowadays by more modern or standardized names.

In addition to common and historical names, chemical compounds may also have synonyms that are specific to a particular field or industry.

  • 1,7-Dimethyl-3,7-dihydro-1H-purine-2,6-dione
  • 1,7-Dimethyl-3,7-dihydro-1H-purine-2,6-dione #
  • 1,7-Dimethyl-3,7-dihydro-1H-purine-2,6-dione (Paraxanthine; 1,7-Dimethylxanthine)
  • 1,7-Dimethylxanthine
  • 1,7-Dimethylxanthine-[13C4,15N3]
  • 1,7-dimethyl-2,3,6,7-tetrahydro-1H-purine-2,6-dione
  • 1,7-dimethyl-3H-purine-2,6-dione
  • 1,7-dimethyl-Xanthine
  • 1H-Purine-2, 3,7-dihydro-1,7-dimethyl-
  • 1H-Purine-2,6-dione, 3,7-dihydro-1,7-dimethyl-
  • 3,7-Dihydro-1,7-dimethyl-1H-purine-2,6-dione
  • 611-59-6
  • A853055
  • AS-64037
  • BDBM50042210
  • BRN 0197907
  • BSPBio_002448
  • CCG-39489
  • CS-W017214
  • Caffeine Impurity F
  • D 5385
  • D5696
  • D94772
  • DB-005072
  • DSSTox_CID_30853
  • DSSTox_GSID_52281
  • DivK1c_000081
  • EU-0100389
  • Eur J Pharmacol 179: 295 (1990)
  • FT-0632550
  • FT-0673516
  • HMS2231K19
  • HMS3261M19
  • HMS3370A12
  • HMS500E03
  • HY-W016498
  • IDI1_000081
  • KBio1_000081
  • KBio3_001668
  • KBioGR_001614
  • LP00389
  • Lopac-D-5385
  • Lopac0_000389
  • MFCD00005727
  • MLS000859929
  • NCGC00015347-01
  • NCGC00015347-02
  • NCGC00015347-03
  • NCGC00015347-04
  • NCGC00015347-05
  • NCGC00015347-06
  • NCGC00015347-07
  • NCGC00015347-09
  • NCGC00093817-01
  • NCGC00093817-02
  • NCGC00093817-03
  • NCGC00093817-04
  • NCGC00261074-01
  • NCGC00357087-01
  • NINDS_000081
  • NSC 400018
  • NSC-400018
  • NSC400018
  • Paraxanthine
  • Q3565Y41V7
  • Q419223
  • SDCCGSBI-0050376.P003
  • SMR000326790
  • SPECTRUM2300170
  • SR-01000075184
  • SR-01000075184-1
  • Xanthine, 1,7-dimethyl-
  • p-Xanthine
  • paraxanthine

Reference codes for other databases

There exist several different chemical codes commonly used in orded to identify molecules:
  • ZINC120234
  • CAS-611-59-6
  • UNII-Q3565Y41V7
  • AKOS015913484
  • BRD-K24084088-001-02-2
  • BRD-K24084088-001-06-3
  • DTXSID2052281
  • CHEMBL1158
  • CHEBI:25858
  • Tox21_303803
  • Tox21_500389
  • EINECS 210-271-9
  • SPBio_001806
  • SCHEMBL232702
  • SCHEMBL4651937
  • Spectrum2_001733
  • Spectrum3_000774
  • Spectrum4_001207
  • Spectrum5_001506

Physico-Chemical properties

IUPAC name1,7-dimethyl-3H-purine-2,6-dione
Molecular formulaC7H8N4O2
Molecular weight180.164
Melting point (ºC)
Boiling point (ºC)
Density (g/cm3)
Molar refractivity47.14
Topological polar surface area72.7

LogP and topological polar surface area (TPSA) values were estimated using Open Babel software.

The n-octanol/water partition coeficient (Kow) data is applied in toxicology and drug research. Kow values are used, to guess the environmental fate of persistent organic pollutants. High partition coefficients values, tend to accumulate in the fatty tissue of organisms. Molecules with a log(Kow) (or LogP) greater than 5 are considered to bioaccumulate.

TPSA values are the sum of the surface area over all polar atoms or molecules, mainly oxygen and nitrogen, also including hydrogen atoms.

In medicinal chemistry, TPSA is used to assess the ability of a drug to permeabilise cells.

For molecules to penetrate the blood-brain barrier (and act on receptors in the central nervous system), TPSA values below 90 Å2 are required. Thus, molecules with a polar surface area greater than 140 Å2 tend to be poorly permeable to cell membranes.