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Record Information
StatusExpected but not Quantified
Creation Date2012-09-06 15:16:52 UTC
Update Date2020-02-26 21:41:34 UTC
Secondary Accession Numbers
  • HMDB15416
Metabolite Identification
Common NameFosamprenavir
DescriptionFosamprenavir is only found in individuals that have used or taken this drug. It is a prodrug of amprenavir, an inhibitor of human immunodeficiency virus (HIV) protease.Fosamprenavir is rapidly hydrolyzed to amprenavir by cellular phosphatases in the gut epithelium as it is absorbed. Amprenavir is an inhibitor of HIV-1 protease. During HIV replication, HIV protease cleaves viral polypeptide products of the Gag and Gag-Pol genes to form structural proteins of the virion core and essential viral enzymes. Amprenavir interferes with this process by binding to the active site of HIV-1 protease, thereby preventing the processing of viral Gag and Gag-Pol polyprotein precursors, resulting in the formation of immature non-infectious viral particles.
(3-(((4-Aminophenyl)sulfonyl)(2-methylpropyl)amino)-1-(phenylmethyl)-2-(phosphonooxy)propyl)carbamic acid C-(tetrahydro-3-furanyl) esterHMDB
Fosamprenavir calciumHMDB
Chemical FormulaC25H36N3O9PS
Average Molecular Weight585.607
Monoisotopic Molecular Weight585.190986967
IUPAC Name{[(2R,3S)-1-[N-(2-methylpropyl)4-aminobenzenesulfonamido]-3-({[(3S)-oxolan-3-yloxy]carbonyl}amino)-4-phenylbutan-2-yl]oxy}phosphonic acid
Traditional Namefosamprenavir
CAS Registry Number226700-79-4
InChI Identifier
Chemical Taxonomy
Description belongs to the class of organic compounds known as aminobenzenesulfonamides. These are organic compounds containing a benzenesulfonamide moiety with an amine group attached to the benzene ring.
KingdomOrganic compounds
Super ClassBenzenoids
ClassBenzene and substituted derivatives
Sub ClassBenzenesulfonamides
Direct ParentAminobenzenesulfonamides
Alternative Parents
  • Aminobenzenesulfonamide
  • Phenylbutylamine
  • Amphetamine or derivatives
  • Benzenesulfonyl group
  • Phosphoethanolamine
  • Aniline or substituted anilines
  • Monoalkyl phosphate
  • Organic phosphoric acid derivative
  • Phosphoric acid ester
  • Organosulfonic acid amide
  • Alkyl phosphate
  • Organic sulfonic acid or derivatives
  • Organosulfonic acid or derivatives
  • Aminosulfonyl compound
  • Tetrahydrofuran
  • Sulfonyl
  • Carboximidic acid derivative
  • Dialkyl ether
  • Ether
  • Oxacycle
  • Organoheterocyclic compound
  • Organic 1,3-dipolar compound
  • Propargyl-type 1,3-dipolar organic compound
  • Organosulfur compound
  • Organooxygen compound
  • Organonitrogen compound
  • Organopnictogen compound
  • Organic oxide
  • Hydrocarbon derivative
  • Primary amine
  • Amine
  • Organic nitrogen compound
  • Organic oxygen compound
  • Aromatic heteromonocyclic compound
Molecular FrameworkAromatic heteromonocyclic compounds
External Descriptors

Biological location:


Industrial application:

Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water Solubility0.68 g/LNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.68 g/LALOGPS
pKa (Strongest Acidic)1.22ChemAxon
pKa (Strongest Basic)2.45ChemAxon
Physiological Charge-2ChemAxon
Hydrogen Acceptor Count8ChemAxon
Hydrogen Donor Count4ChemAxon
Polar Surface Area177.72 ŲChemAxon
Rotatable Bond Count13ChemAxon
Refractivity144.95 m³·mol⁻¹ChemAxon
Polarizability57.77 ųChemAxon
Number of Rings3ChemAxon
Rule of FiveNoChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash KeyView
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-0006-9105310000-2bf3c66449e76886fd4cSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0a4r-9000410000-a4ed06be5677009d5152Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0a4i-9000000000-61429bd749fc1970bd15Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0a4i-9010000000-df39dc7519473ac39907Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-002b-9200740000-56d180057627a10f872bSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-004i-9110210000-4b73b6264e2b0dc68d44Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-004i-9100000000-3a6decb74ff0fdced13cSpectrum
Biological Properties
Cellular Locations
  • Cytoplasm
  • Membrane
Biospecimen Locations
  • Blood
  • Urine
Tissue LocationsNot Available
Normal Concentrations
BloodExpected but not QuantifiedNot QuantifiedNot AvailableNot AvailableTaking drug identified by DrugBank entry DB01319 details
UrineExpected but not QuantifiedNot QuantifiedNot AvailableNot AvailableTaking drug identified by DrugBank entry DB01319 details
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDDB01319
Phenol Explorer Compound IDNot Available
FooDB IDNot Available
KNApSAcK IDNot Available
Chemspider ID116245
KEGG Compound IDNot Available
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkFosamprenavir
METLIN IDNot Available
PubChem Compound131536
PDB IDNot Available
ChEBI ID82941
Food Biomarker OntologyNot Available
VMH IDNot Available
MarkerDB ID
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Falcoz C, Jenkins JM, Bye C, Hardman TC, Kenney KB, Studenberg S, Fuder H, Prince WT: Pharmacokinetics of GW433908, a prodrug of amprenavir, in healthy male volunteers. J Clin Pharmacol. 2002 Aug;42(8):887-98. [PubMed:12162471 ]
  2. Wood R, Arasteh K, Stellbrink HJ, Teofilo E, Raffi F, Pollard RB, Eron J, Yeo J, Millard J, Wire MB, Naderer OJ: Six-week randomized controlled trial to compare the tolerabilities, pharmacokinetics, and antiviral activities of GW433908 and amprenavir in human immunodeficiency virus type 1-infected patients. Antimicrob Agents Chemother. 2004 Jan;48(1):116-23. [PubMed:14693528 ]
  3. Furfine ES, Baker CT, Hale MR, Reynolds DJ, Salisbury JA, Searle AD, Studenberg SD, Todd D, Tung RD, Spaltenstein A: Preclinical pharmacology and pharmacokinetics of GW433908, a water-soluble prodrug of the human immunodeficiency virus protease inhibitor amprenavir. Antimicrob Agents Chemother. 2004 Mar;48(3):791-8. [PubMed:14982766 ]
  4. Sension M: Initial therapy for human immunodeficiency virus: broadening the options. HIV Clin Trials. 2004 Mar-Apr;5(2):99-111. [PubMed:15116286 ]
  5. Chapman TM, Plosker GL, Perry CM: Fosamprenavir: a review of its use in the management of antiretroviral therapy-naive patients with HIV infection. Drugs. 2004;64(18):2101-24. [PubMed:15341507 ]
  6. Wire MB, Shelton MJ, Studenberg S: Fosamprenavir : clinical pharmacokinetics and drug interactions of the amprenavir prodrug. Clin Pharmacokinet. 2006;45(2):137-68. [PubMed:16485915 ]
  7. Hoffman RM, Umeh OC, Garris C, Givens N, Currier JS: Evaluation of sex differences of fosamprenavir (with and without ritonavir) in HIV-infected men and women. HIV Clin Trials. 2007 Nov-Dec;8(6):371-80. [PubMed:18042502 ]
  8. Smith KY, Weinberg WG, Dejesus E, Fischl MA, Liao Q, Ross LL, Pakes GE, Pappa KA, Lancaster CT: Fosamprenavir or atazanavir once daily boosted with ritonavir 100 mg, plus tenofovir/emtricitabine, for the initial treatment of HIV infection: 48-week results of ALERT. AIDS Res Ther. 2008 Mar 28;5:5. doi: 10.1186/1742-6405-5-5. [PubMed:18373851 ]


General function:
Involved in monooxygenase activity
Specific function:
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It performs a variety of oxidation reactions (e.g. caffeine 8-oxidation, omeprazole sulphoxidation, midazolam 1'-hydroxylation and midazolam 4-hydroxylation) of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Acts as a 1,8-cineole 2-exo-monooxygenase. The enzyme also hydroxylates etoposide.
Gene Name:
Uniprot ID:
Molecular weight:
  1. Wire MB, Shelton MJ, Studenberg S: Fosamprenavir : clinical pharmacokinetics and drug interactions of the amprenavir prodrug. Clin Pharmacokinet. 2006;45(2):137-68. [PubMed:16485915 ]
  2. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. doi: 10.1093/nar/gkp970. Epub 2009 Nov 24. [PubMed:19934256 ]