Isotopically Labeled Compounds
Medchemexpress LLC Isonicotinic acid-d4 | 53907-55-4 | 98.1% | 127.13 | C6HD4NO2 | 10 MG
Isonicotinic acid-d4 is the deuterium-labeled analog of isonicotinic acid, provided as an analytical standard for research and quantitative mass spectrometry. It is used as a stable isotope internal standard or tracer in metabolic and analytical studies, supplied in small laboratory pack sizes such as 10 MG.
- Deuterium-labeled internal standard for mass spectrometry.
- High purity suitable for analytical applications (≈98.1%).
- CAS number 53907-55-4 for unambiguous identification.
- Molecular weight 127.13 g/mol for calculation and method development.
- Available in small pack sizes, for example 10 MG, for laboratory use.
- Store sealed and protected from moisture; in solvent: -80°C for long-term storage, -20°C for short-term storage.
Medchemexpress LLC 1-methylimidazole-d6 | 285978-27-0 | MFCD00190485 | 98.8% | 88.14 | C4D6N2 | 10 MG
1-Methylimidazole-d6 is the deuterium-labeled isotopologue of 1-methylimidazole supplied for use as an isotopic reference and internal standard in analytical laboratories. It is intended for tracer and quantitative applications in NMR, GC-MS, and LC-MS workflows.
- Deuterium-labeled internal standard for quantitative analysis by NMR, GC-MS, and LC-MS.
- High chemical purity (≈98.8%) and consistent isotopic enrichment for reliable results.
- Molecular weight 88.14 and molecular formula C4D6N2 for precise mass calculations.
- Available in small, laboratory-scale quantities suitable for standard analytical protocols.
Medchemexpress LLC Aripiprazole-d8 | 1089115-06-9 | MFCD08460937 | 98.4% | 456.43 g/mol | C23H19D8Cl2N3O2 | 5 MG
Aripiprazole-d8 is the deuterium-labeled analogue of aripiprazole supplied for research use as a stable isotope reference standard. It is provided as a high-purity, small-mass sample intended for use as an internal standard in mass spectrometry and for analytical method development and pharmacokinetic studies.
- Stable isotope-labeled internal standard for LC-MS/MS.
- High purity suitable for analytical applications.
- Small 5 mg sample size for solution preparation and method development.
- Supports pharmacokinetic and metabolite studies.
- Suitable for quantitative and qualitative mass spectrometry assays.
Medchemexpress LLC Maleic hydrazide-d2 | 2398483-97-9 | 99.3% | 114.10 g/mol | C4H2D2N2O2 | 10 MG
Maleic hydrazide-d2 is the deuterium-labeled form of maleic hydrazide supplied for research use. It is used as a plant growth regulator and herbicide and is suitable as an isotopically labeled internal standard or tracer for analytical methods such as NMR, GC-MS, and LC-MS.
- Deuterium-labeled compound (d2) for tracer and standard use.
- Molecular formula C4H2D2N2O2 and molecular weight 114.10 g/mol.
- High purity suitable for analytical applications.
- Offered in small research quantities for laboratory workflows.
- Store powder at -20°C (3 years) or 4°C (2 years); in solvent at -80°C (6 months).
- Intended for research use only; not for clinical or patient use.
Medchemexpress LLC Zanubrutinib-d5 | 00-00-0 | 99.0% | 476.58 g/mol | C27H24D5N5O3 | 1 MG
Zanubrutinib-d5 is a deuterium-labeled analogue of zanubrutinib intended for research use as a tracer or internal standard in quantitative analyses by NMR, GC-MS, and LC-MS. It is supplied as a solid for laboratory studies and therapeutic drug monitoring method development.
- Deuterium-labeled internal standard for quantitative analysis
- Purity: 99.0%
- Molecular formula: C27H24D5N5O3; molecular weight: 476.58 g/mol
- Appearance: white to off-white solid
- Solubility: DMSO 30 mg/mL; may require ultrasonic and warming
- Storage: powder -20°C (3 years) or 4°C (2 years); in solvent -80°C (6 months)
- Packaged in small-mass units suitable for analytical standards (1 mg available)
Cambridge Isotope Laboratories DL-ALANINE (1-13C, 99%), 1 G, 102029-81-2
DL-ALANINE (1-13C, 99%), 1 G, 102029-81-2
Medchemexpress LLC D-ribose-13C | 70849-24-0 | MFCD00064325 | 99.9% | 151.12 g/mol | (13C)C4H10O5 | 100 MG
D-ribose-13C is a stable isotope-labeled form of D-ribose supplied as a white to off-white solid for laboratory research. It is used as a positional tracer in metabolic and biochemical studies to follow ribose incorporation and quantify metabolic flux by analytical techniques such as NMR and mass spectrometry. The material is high purity and packaged in small quantities for research-scale experiments.
- 13C-labeled at carbon-1 for positional tracing.
- High purity suitable for analytical applications.
- White to off-white solid form for easy handling and storage.
- Compatible with NMR and mass spectrometry workflows.
- Available in small package sizes for research-scale experiments.
- Intended for research use only; not for human consumption.
Medchemexpress LLC Remdesivir-d5 (GS-5734-d5) | 00-00-0 | 99.9% | 607.61 g·mol⁻1 | C27H30D5N6O8P | 1 MG
Remdesivir-d5 (GS-5734-d5) is a deuterium-labeled analogue of the antiviral nucleoside remdesivir, provided as an isotopic internal standard for analytical and research applications. It is intended for quantitative studies by LC-MS, GC-MS, and NMR and is supplied as a white to off-white solid.
- Deuterium-labeled internal standard for quantitative analysis
- High chemical purity and isotopic enrichment
- Molecular formula C27H30D5N6O8P; molecular weight 607.61 g·mol⁻1
- Supplied as a white to off-white solid with reported purity 99.9%
- Storage: powder at -20°C for long-term, 4°C for short-term
- For research use only; not for human use
![Revvity Health Sciences Inc Deoxythymidine 5'-Triphosphate, [Methyl-<sup>3</sup>H]-, Tetrasodium Salt, Specific Activity: 10-25 Ci (370-925 GBq)/mmol, 1 mCi (37 MBq)](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502812386.jpg-250.jpg)
Revvity Health Sciences Inc Deoxythymidine 5'-Triphosphate, [Methyl-3H]-, Tetrasodium Salt, Specific Activity: 10-25 Ci (370-925 GBq)/mmol, 1 mCi (37 MBq)
Deoxythymidine 5'-Triphosphate, [Methyl-3H]-, Tetrasodium Salt, Specific Activity: 10-25 Ci (370-925 GBq)/mmol, 1 mCi (37 MBq)
Cambridge Isotope Laboratories ALPHA-KETOISOVALERIC ACID, SODIUM SALT (DIMETHYL-13C2, 99%), 0.5 G
ALPHA-KETOISOVALERIC ACID, SODIUM SALT (DIMETHYL-13C2, 99%), 0.5 G
Medchemexpress LLC Urea-13C (carbonyl diamide-13C) | 58069-82-2 | MFCD00064398 | 99.1% | 61.05 g/mol | 13CH4N2O | 50 MG
Urea-13C is urea labeled with the stable isotope carbon-13 (13C), provided as a solid reagent for diagnostic and analytical applications. It is used as the substrate in the 13C-urea breath test for detection of Helicobacter pylori and as a tracer or internal standard for quantitative NMR, GC-MS, and LC-MS analyses.
- 13C enrichment of 99.1%.
- Suitable as substrate for 13C-urea breath testing to detect Helicobacter pylori.
- Useful as tracer and internal standard for NMR, GC-MS, and LC-MS quantitative analysis.
- Solid, white to off-white physical form for easy handling and storage.
- Available in small pack sizes such as 50 mg for research use.
Cayman Chemical Methotrexate-d3 1mg
An internal standard for the quantification of methotrexate by GC- or LC-MS
![Revvity Health Sciences Inc Triiodothyronine, L-3, 5, 3'-[<sup>125</sup>I]-, 100 µCi (3.7 MBq), Specific Activity: 1080-1320 µCi (40-48.8 MBq)/µg](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502811009.jpg-250.jpg)
Revvity Health Sciences Inc Triiodothyronine, L-3, 5, 3'-[125I]-, 100 µCi (3.7 MBq), Specific Activity: 1080-1320 µCi (40-48.8 MBq)/µg
Triiodothyronine, L-3, 5, 3'-[125I]-, 100 µCi (3.7 MBq), Specific Activity: 1080-1320 µCi (40-48.8 MBq)/µg
Medchemexpress LLC Sotalol-d6 hydrochloride | 1246820-85-8 | 98.0% | 314.86 | C12H15D6ClN2O3S | 10 MG
Sotalol-d6 hydrochloride is the deuterium-labeled isotopologue of sotalol hydrochloride provided as the hydrochloride salt for use as a stable-isotope reference standard in analytical and pharmacokinetic research. The deuterated compound is intended for tracer, quantitation, and internal standard applications in LC-MS workflows.
- Deuterium-labeled internal standard for LC-MS quantitation.
- Hydrochloride salt form for stability and solubility.
- High purity (≈98.0%) suitable for analytical use.
- Suitable for pharmacokinetic and tracer studies.
- Available in small reference pack sizes (for example, 10 mg).
Revvity Health Sciences Inc Iodine-125 Radionuclide, 2mCi, Specific Activity: ~17Ci/mg, 0.1M NaOH (pH 12-14), Concentration: >350mCi/mL
Iodine-125 Radionuclide, 2mCi, Specific Activity: ~17Ci/mg, 0.1M NaOH (pH 12-14), Concentration: >350mCi/mL