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Record Information
Version1.0
Creation Date2016-09-30 22:28:03 UTC
Update Date2020-06-04 20:52:17 UTC
MCDB ID BMDB0000300
Secondary Accession Numbers
  • BMDB00300
Metabolite Identification
Common NameUracil
DescriptionUracil, also known as U or hybar X, belongs to the class of organic compounds known as pyrimidones. Pyrimidones are compounds that contain a pyrimidine ring, which bears a ketone. Pyrimidine is a 6-membered ring consisting of four carbon atoms and two nitrogen centers at the 1- and 3- ring positions. Uracil exists as a solid, possibly soluble (in water), and an extremely weak basic (essentially neutral) compound (based on its pKa) molecule. Uracil exists in all living species, ranging from bacteria to humans. Uracil is a potentially toxic compound.
Structure
Thumb
Synonyms
ValueSource
2,4(1H,3H)-PyrimidinedioneChEBI
2,4-DioxopyrimidineChEBI
2,4-PyrimidinedioneChEBI
UChEBI
UraChEBI
UrazilChEBI
2,4-DihydroxypyrimidineHMDB
2,4-PyrimidinediolHMDB
Hybar XHMDB
PirodHMDB
PyrodHMDB
Chemical FormulaC4H4N2O2
Average Molecular Weight112.0868
Monoisotopic Molecular Weight112.027277382
IUPAC Name1,2,3,4-tetrahydropyrimidine-2,4-dione
Traditional Nameuracil
CAS Registry Number66-22-8
SMILES
O=C1NC=CC(=O)N1
InChI Identifier
InChI=1S/C4H4N2O2/c7-3-1-2-5-4(8)6-3/h1-2H,(H2,5,6,7,8)
InChI KeyISAKRJDGNUQOIC-UHFFFAOYSA-N
Chemical Taxonomy
Description belongs to the class of organic compounds known as pyrimidones. Pyrimidones are compounds that contain a pyrimidine ring, which bears a ketone. Pyrimidine is a 6-membered ring consisting of four carbon atoms and two nitrogen centers at the 1- and 3- ring positions.
KingdomOrganic compounds
Super ClassOrganoheterocyclic compounds
ClassDiazines
Sub ClassPyrimidines and pyrimidine derivatives
Direct ParentPyrimidones
Alternative Parents
Substituents
  • Pyrimidone
  • Hydropyrimidine
  • Heteroaromatic compound
  • Vinylogous amide
  • Urea
  • Lactam
  • Azacycle
  • Organic nitrogen compound
  • Organic oxygen compound
  • Organopnictogen compound
  • Organic oxide
  • Hydrocarbon derivative
  • Organooxygen compound
  • Organonitrogen compound
  • Aromatic heteromonocyclic compound
Molecular FrameworkAromatic heteromonocyclic compounds
External Descriptors
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting Point330 °CNot Available
Boiling PointNot AvailableNot Available
Water Solubility3.6 mg/mLNot Available
LogP-1.07HANSCH,C ET AL. (1995)
Predicted Properties
PropertyValueSource
logP-1.2ALOGPS
logP-0.86ChemAxon
logS-0.63ALOGPS
pKa (Strongest Acidic)8.8ChemAxon
pKa (Strongest Basic)-5.5ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count2ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area58.2 ŲChemAxon
Rotatable Bond Count0ChemAxon
Refractivity25.97 m³·mol⁻¹ChemAxon
Polarizability9.37 ųChemAxon
Number of Rings1ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Spectra
Spectrum TypeDescriptionSplash KeyDeposition DateView
GC-MSGC-MS Spectrum - GC-EI-TOF (Pegasus III TOF-MS system, Leco; GC 6890, Agilent Technologies) (Non-derivatized)splash10-0002-5950000000-18425875415ad150c4fc2014-06-16View Spectrum
GC-MSGC-MS Spectrum - GC-EI-TOF (Pegasus III TOF-MS system, Leco; GC 6890, Agilent Technologies) (2 TMS)splash10-006t-9740000000-e884a4b98e7e9dc75e5f2014-06-16View Spectrum
GC-MSGC-MS Spectrum - GC-MS (2 TMS)splash10-052e-7790000000-026cb6beb5cde6a61b802014-06-16View Spectrum
GC-MSGC-MS Spectrum - EI-B (Non-derivatized)splash10-02tc-9200000000-4a57c4e06fd552d6a9bf2017-09-12View Spectrum
GC-MSGC-MS Spectrum - EI-B (Non-derivatized)splash10-03xu-9400000000-1c29f070a8135b06f88b2017-09-12View Spectrum
GC-MSGC-MS Spectrum - GC-EI-TOF (Non-derivatized)splash10-0002-5950000000-18425875415ad150c4fc2017-09-12View Spectrum
GC-MSGC-MS Spectrum - GC-EI-TOF (Non-derivatized)splash10-006t-9740000000-e884a4b98e7e9dc75e5f2017-09-12View Spectrum
GC-MSGC-MS Spectrum - GC-MS (Non-derivatized)splash10-052e-7790000000-026cb6beb5cde6a61b802017-09-12View Spectrum
GC-MSGC-MS Spectrum - GC-EI-TOF (Non-derivatized)splash10-0002-6940000000-a726178341f6443e60cc2017-09-12View Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-03xu-9300000000-6a96f6ce1ef7316891072016-09-22View Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, PositiveNot Available2021-10-12View Spectrum
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 10V, Positive (Annotated)splash10-03di-3900000000-e422eda255a4b6414f862012-07-24View Spectrum
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 25V, Positive (Annotated)splash10-006y-9000000000-130eb5f4414426e036672012-07-24View Spectrum
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 40V, Positive (Annotated)splash10-0006-9100000000-c096d08ca715d97cd7322012-07-24View Spectrum
LC-MS/MSLC-MS/MS Spectrum - EI-B (HITACHI M-60) , Positivesplash10-02tc-9200000000-83a0a6ad4fc1b407e5702012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - EI-B (HITACHI M-80) , Positivesplash10-03xu-9400000000-acd0cfd54af7d6a552832012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 10V, Negativesplash10-03di-0900000000-309fe212c929f3c6a9302012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 20V, Negativesplash10-03di-6900000000-55a7de75a40eab61da8b2012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 30V, Negativesplash10-0006-9000000000-1c3caab26eb7e359db922012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 40V, Negativesplash10-0006-9000000000-7494d4e611a73ecb79ea2012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 50V, Negativesplash10-0006-9000000000-ed4046b040337db620d82012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QTOF (UPLC Q-Tof Premier, Waters) , Positivesplash10-03di-0900000000-ff54f3083ce4ccccfd952012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QTOF (UPLC Q-Tof Premier, Waters) , Negativesplash10-03di-0900000000-6728c1eb6f68b40c09f82012-08-31View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ , negativesplash10-03di-0900000000-309fe212c929f3c6a9302017-09-14View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ , negativesplash10-03di-6900000000-55a7de75a40eab61da8b2017-09-14View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ , negativesplash10-0006-9000000000-1c3caab26eb7e359db922017-09-14View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ , negativesplash10-0006-9000000000-7494d4e611a73ecb79ea2017-09-14View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ , negativesplash10-0006-9000000000-ed4046b040337db620d82017-09-14View Spectrum
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QTOF , negativesplash10-03di-0900000000-6728c1eb6f68b40c09f82017-09-14View Spectrum
LC-MS/MSLC-MS/MS Spectrum - , negativesplash10-03di-0900000000-a21102c708f8d5eaf2622017-09-14View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-03di-1900000000-0029cbdcaa1377a4d03e2015-05-26View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0229-9400000000-c227e1deb392170cb3232015-05-26View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0006-9000000000-3cf6f9fc3ab6890266ac2015-05-26View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-03di-4900000000-67a3d94ab649e28bda132015-05-27View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-0006-9100000000-bbf50de54fc413b6588e2015-05-27View Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0006-9000000000-98042b91f1087b0c25632015-05-27View Spectrum
MSMass Spectrum (Electron Ionization)splash10-03xu-9400000000-d7ffe72f606f1af3349b2014-09-20View Spectrum
1D NMR13C NMR Spectrum (1D, 125 MHz, H2O, experimental)Not Available2012-12-04View Spectrum
1D NMR1H NMR Spectrum (1D, 500 MHz, H2O, experimental)Not Available2012-12-04View Spectrum
1D NMR1H NMR Spectrum (1D, 400 MHz, DMSO-d6, experimental)Not Available2014-09-20View Spectrum
1D NMR13C NMR Spectrum (1D, 100.72 MHz, DMSO-d6, experimental)Not Available2014-09-23View Spectrum
1D NMR1H NMR Spectrum (1D, D2O, experimental)Not Available2016-10-22View Spectrum
1D NMR13C NMR Spectrum (1D, 100 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 100 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 1000 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 1000 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 200 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 200 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 300 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 300 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 400 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 400 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 500 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 500 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 600 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 600 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 700 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 700 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 800 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 800 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR13C NMR Spectrum (1D, 900 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
1D NMR1H NMR Spectrum (1D, 900 MHz, D2O, predicted)Not Available2021-09-29View Spectrum
2D NMR[1H, 1H]-TOCSY. Unexported temporarily by An Chi on Oct 15, 2021 until json or nmrML file is generated. 2D NMR Spectrum (experimental)Not Available2012-12-04View Spectrum
2D NMR[1H, 13C]-HSQC NMR Spectrum (2D, 600 MHz, H2O, experimental)Not Available2012-12-05View Spectrum
Concentrations
StatusValueReferenceDetails
Detected but not QuantifiedNot Applicable
  • Kurt J. Boudonck,...
details
Detected but not QuantifiedNot Applicable details
Detected but not QuantifiedNot Applicable
  • Kurt J. Boudonck,...
details
Detected but not QuantifiedNot Applicable details
HMDB IDHMDB0000300
DrugBank IDDB03419
Phenol Explorer Compound IDNot Available
FoodDB IDFDB006426
KNApSAcK IDC00001513
Chemspider ID1141
KEGG Compound IDC00106
BioCyc IDURACIL
BiGG ID33879
Wikipedia LinkUracil
METLIN ID258
PubChem Compound1174
PDB IDNot Available
ChEBI ID17568
References
Synthesis ReferenceBurckhalter, J. H.; Scarborough, Homer C. The synthesis of uracils as anticonvulsants. Journal of the American Pharmaceutical Association (1912-1977) (1955), 44 545-50.
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Melzer N, Wittenburg D, Hartwig S, Jakubowski S, Kesting U, Willmitzer L, Lisec J, Reinsch N, Repsilber D: Investigating associations between milk metabolite profiles and milk traits of Holstein cows. J Dairy Sci. 2013 Mar;96(3):1521-34. doi: 10.3168/jds.2012-5743. [PubMed:23438684 ]
  2. Mung D, Li L: Development of Chemical Isotope Labeling LC-MS for Milk Metabolomics: Comprehensive and Quantitative Profiling of the Amine/Phenol Submetabolome. Anal Chem. 2017 Apr 18;89(8):4435-4443. doi: 10.1021/acs.analchem.6b03737. Epub 2017 Mar 28. [PubMed:28306241 ]
  3. Kurt J. Boudonck, Matthew W. Mitchell, Jacob Wulff and John A. Ryals (2009). Kurt J. Boudonck, Matthew W. Mitchell, Jacob Wulff and John A. Ryals. Characterization of the biochemical variability of bovine milk using metabolomics. Metabolomics (2009) 5:375?386. Metabolomics.