You are using an unsupported browser. Please upgrade your browser to a newer version to get the best experience on Human Metabolome Database.
Record Information
StatusExpected but not Quantified
Creation Date2012-09-06 15:16:49 UTC
Update Date2020-02-26 21:39:56 UTC
Secondary Accession Numbers
  • HMDB14590
Metabolite Identification
Common NameLoracarbef
DescriptionLoracarbef is only found in individuals that have used or taken this drug. It is a carbacephem antibiotic sometimes grouped together with the second-generation cephalosporin antibiotics. It is marketed under the trade name Lorabid.Loracarbef is an oral, synthetic beta-lactam antibiotic of the carbacephem class. Chemically, carbacephems differ from cephalosporin-class antibiotics in the dihydrothiazine ring where a methylene group has been substituted for a sulfur atom. Loracarbef has a spectrum of activity similar to that of the second generation cephalosporins. It is structurally identical to cefaclor except for a sulfur atom that has been replaced by a methylene group. This change gives greater chemical stability in solution and allows storage at room temperature. Loracarbef, like all b-lactams and cephalosporins, inhibits penicillin binding proteins, enzymes that create the cross-linkage of the peptidoglycan polymer. This binding leads to interference with the formation and remodeling of the cell wall structure.
Lilly brand OF loracarbef monohydrateHMDB
Monarch brand OF loracarbef monohydrateHMDB
Zambon brand OF loracarbef monohydrateHMDB
Lilly brand OF loracarbefHMDB
Syntex brand OF loracarbef monohydrateHMDB
Loracarbef monohydrateHMDB
Chemical FormulaC16H16ClN3O4
Average Molecular Weight349.769
Monoisotopic Molecular Weight349.082933722
IUPAC Name(6R,7S)-7-[(2R)-2-amino-2-phenylacetamido]-3-chloro-8-oxo-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Traditional Nameloracabef
CAS Registry Number76470-66-1
InChI Identifier
Chemical Taxonomy
Description belongs to the class of organic compounds known as carbacephems. These are a new class of beta-lactam antibiotics similar in structure to the cephalosporins. They differ from cephalosporins, however, in the substitution of a sulfur atom in the dihydrothiazine ring with a methylene group to form a tetrahydropyridine ring.
KingdomOrganic compounds
Super ClassOrganoheterocyclic compounds
Sub ClassBeta lactams
Direct ParentCarbacephems
Alternative Parents
  • Carbacephem
  • N-acyl-alpha amino acid or derivatives
  • Alpha-amino acid amide
  • Alpha-amino acid or derivatives
  • Phenylacetamide
  • Tetrahydropyridine
  • Aralkylamine
  • Monocyclic benzene moiety
  • Benzenoid
  • Tertiary carboxylic acid amide
  • Vinylogous halide
  • Amino acid or derivatives
  • Azetidine
  • Carboxamide group
  • Amino acid
  • Secondary carboxylic acid amide
  • Haloalkene
  • Chloroalkene
  • Vinyl halide
  • Vinyl chloride
  • Azacycle
  • Carboxylic acid derivative
  • Carboxylic acid
  • Monocarboxylic acid or derivatives
  • Hydrocarbon derivative
  • Organic nitrogen compound
  • Primary aliphatic amine
  • Organohalogen compound
  • Organochloride
  • Amine
  • Carbonyl group
  • Organic oxide
  • Organopnictogen compound
  • Organic oxygen compound
  • Organonitrogen compound
  • Organooxygen compound
  • Primary amine
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External Descriptors

Biological location:


Industrial application:

Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water Solubility0.32 g/LNot Available
LogP0.5Not Available
Predicted Properties
Water Solubility0.32 g/LALOGPS
pKa (Strongest Acidic)3.13ChemAxon
pKa (Strongest Basic)7.44ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count5ChemAxon
Hydrogen Donor Count3ChemAxon
Polar Surface Area112.73 ŲChemAxon
Rotatable Bond Count4ChemAxon
Refractivity86.64 m³·mol⁻¹ChemAxon
Polarizability32.61 ųChemAxon
Number of Rings3ChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Spectrum TypeDescriptionSplash KeyView
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-0a4i-8901000000-9624c4237beed0fc58b1Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (1 TMS) - 70eV, Positivesplash10-004i-6911000000-1942c1bc1b579dcb17ffSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0pvi-0946000000-df5d2ead7c26276f85f9Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0aor-1930000000-9d4196e112fdc37ad21bSpectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0a4i-4900000000-57e592b2ff0c830fc344Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0002-0319000000-e45ecb0b8853bd1bf498Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-052r-1901000000-ffe4f565f43063b475b1Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0a6u-8900000000-e8d02c2084b2878efcdaSpectrum
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 DB00447 details
UrineExpected but not QuantifiedNot QuantifiedNot AvailableNot AvailableTaking drug identified by DrugBank entry DB00447 details
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDDB00447
Phenol Explorer Compound IDNot Available
FooDB IDNot Available
KNApSAcK IDNot Available
Chemspider ID4447635
KEGG Compound IDC08109
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkLoracarbef
METLIN IDNot Available
PubChem Compound5284585
PDB IDNot Available
ChEBI ID47544
Food Biomarker OntologyNot Available
VMH IDNot Available
MarkerDB ID
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Copper RD: The carbacephems: a new beta-lactam antibiotic class. Am J Med. 1992 Jun 22;92(6A):2S-6S. [PubMed:1621741 ]
  2. Brogden RN, McTavish D: Loracarbef. A review of its antimicrobial activity, pharmacokinetic properties and therapeutic efficacy. Drugs. 1993 May;45(5):716-36. [PubMed:7686466 ]
  3. Dantzig AH, Duckworth DC, Tabas LB: Transport mechanisms responsible for the absorption of loracarbef, cefixime, and cefuroxime axetil into human intestinal Caco-2 cells. Biochim Biophys Acta. 1994 Apr 20;1191(1):7-13. [PubMed:8155686 ]
  4. Force RW, Nahata MC: Loracarbef: a new orally administered carbacephem antibiotic. Ann Pharmacother. 1993 Mar;27(3):321-9. [PubMed:8453172 ]


General function:
Involved in transporter activity
Specific function:
Proton-coupled intake of oligopeptides of 2 to 4 amino acids with a preference for dipeptides. May constitute a major route for the absorption of protein digestion end-products
Gene Name:
Uniprot ID:
Molecular weight:
  1. Wenzel U, Gebert I, Weintraut H, Weber WM, Clauss W, Daniel H: Transport characteristics of differently charged cephalosporin antibiotics in oocytes expressing the cloned intestinal peptide transporter PepT1 and in human intestinal Caco-2 cells. J Pharmacol Exp Ther. 1996 May;277(2):831-9. [PubMed:8627565 ]
General function:
Involved in transporter activity
Specific function:
Proton-coupled intake of oligopeptides of 2 to 4 amino acids with a preference for dipeptides
Gene Name:
Uniprot ID:
Molecular weight:
  1. Boll M, Herget M, Wagener M, Weber WM, Markovich D, Biber J, Clauss W, Murer H, Daniel H: Expression cloning and functional characterization of the kidney cortex high-affinity proton-coupled peptide transporter. Proc Natl Acad Sci U S A. 1996 Jan 9;93(1):284-9. [PubMed:8552623 ]