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  3. Didox

Didox  (Synonyms: NSC-324360)

Cat. No.: HY-19387 Purity: 98.24%
COA Handling Instructions

Didox (NSC-324360) is a synthetic ribonucleotide reductase (RR) inhibitor.

For research use only. We do not sell to patients.

Didox Chemical Structure

Didox Chemical Structure

CAS No. : 69839-83-4

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Solid + Solvent
10 mM * 1 mL in DMSO
ready for reconstitution
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10 mM * 1 mL in DMSO USD 66 In-stock
5 mg USD 60 In-stock
10 mg USD 80 In-stock
25 mg USD 170 In-stock
50 mg USD 260 In-stock
100 mg USD 400 In-stock
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Customer Review

Based on 12 publication(s) in Google Scholar

Top Publications Citing Use of Products

    Didox purchased from MedChemExpress. Usage Cited in: J Ethnopharmacol. 2018 Dec 5;227:166-175.  [Abstract]

    The hepa 1c1c7 cells are treated with indicated doses of extracts along with LPS (1 μg/mL) for 24 h, and then the accumulation of nitrite from the supernatants is evaluated by Griess reagent. Didox (DI) is used as a positive control, and possessed an inhibitory rate of about 70% at 100 μM.

    Didox purchased from MedChemExpress. Usage Cited in: Oxid Med Cell Longev. 2018 Mar 20;2018:7616852.  [Abstract]

    MPP inhibits the NF-κB-dependent luciferase activity. After being cotransfected with NF-κB firefly luciferase and TK-Renilla luciferase, cells are pretreated with MPP (25 μM) or Didox (100 μM) for 1 h and cotreated with LPS (1 μg/mL) for 16 h.
    • Biological Activity

    • Protocol

    • Purity & Documentation

    • References

    • Customer Review


    Didox (NSC-324360) is a synthetic ribonucleotide reductase (RR) inhibitor.

    IC50 & Target

    Ribonucleotide reductase[1]

    In Vitro

    Didox (NSC-324360) suppresses LPS-induced mRNA levels of iNOS, IL-6, IL-1, TNF-α, NF-κβ (p65), and p38-α, after 24 h of treatment. Treatment with Didox also suppresses the secretion of nitric oxide (NO), IL-6, and IL-10. Using mitochondrial dehydrogenase activity as a measure of cytotoxicity, the effects of Didox on cellular respiration in RAW264.7 are examined over a range of concentrations for 24 h. Cells exposures to 200 μM and below Didox, with and without LPS, do not exhibit significant cellular toxicity[1]. Didox (NSC-324360) is active against all human and murine acute myeloid leukemia (AML) lines tested with IC50 values in the low micromolar range (mean IC50 37 µM [range 25.89-52.70 µM])[2].

    MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

    In Vivo

    Once engraftment is established by bioluminescent imaging, the animals receive daily administrations of Didox at 425 mg/kg via IP injection over 5 days. Didox (NSC-324360) treatment significantly reduces leukemic burden compared to vehicle treated controls (p=0.0026 and p=0.0342). More importantly, Didox (NSC-324360) provides a significant survival benefit (p<0.0001 and p=0.0094)[2].

    MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

    Molecular Weight




    CAS No.



    Light yellow to khaki




    Room temperature in continental US; may vary elsewhere.

    Powder -20°C 3 years
    4°C 2 years
    In solvent -80°C 6 months
    -20°C 1 month
    Solvent & Solubility
    In Vitro: 

    DMSO : 100 mg/mL (591.26 mM; Need ultrasonic)

    Stock Solutions
    Concentration Solvent Mass 1 mg 5 mg 10 mg
    1 mM 5.9126 mL 29.5631 mL 59.1261 mL
    5 mM 1.1825 mL 5.9126 mL 11.8252 mL
    10 mM 0.5913 mL 2.9563 mL 5.9126 mL
    *Please refer to the solubility information to select the appropriate solvent.
    In Vivo:
    • 1.

      Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

      Solubility: ≥ 2.75 mg/mL (16.26 mM); Clear solution

    • 2.

      Add each solvent one by one:  10% DMSO    90% (20% SBE-β-CD in Saline)

      Solubility: ≥ 2.75 mg/mL (16.26 mM); Clear solution

    • 3.

      Add each solvent one by one:  10% DMSO    90% Corn Oil

      Solubility: ≥ 2.75 mg/mL (16.26 mM); Clear solution

    *All of the co-solvents are available by MedChemExpress (MCE).
    Purity & Documentation
    Cell Assay

    RAW264.7 macrophages are treated with Didox alone, with 0.1 μg/mL LPS, or the two in combination. Cellular respiration, as an indication of cytotoxicity, is measured by the MTT assay, which quantifies mitochondrial dehydrogenase activity. Macrophages are plated into 96 well Costar plates at 105 cells per well in 100 μL of DMEM media. After 4 h of incubation at 37°C for adherence, compounds and DMSO carrier control (0.01% final) are added in triplicate over serial dilutions beginning with 200 μM per well in a total volume of 200 μL, and the plates incubated for 24 h. Four h before termination of the assay, each well receives 20 μL of a 5 mg/mL MTT solution in un-supplemented DMEM. After centrifugation, the supernatant for each well is discarded and cells containing reduced MTT are solubilized with 100 μL of acidified isopropanol (4 mM HCl, 0.1% NP-40 in isopropanol). Following a brief period of shaking, the optical density (O.D.) for each well is recorded at 550 nm. Each experiment is repeated three times and the data averaged from each triplicate, then expressed as percentage of the control O.D. values for each experiment[1].

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Animal Administration

    Luciferase-tagged leukemia cells are transplanted into 8- week old, sublethally irradiated (4.5 Gy) C57Bl/6 mice by tail vein injection of 1.0×106 cells per mouse. Mice are injected with 150 mg/kg D-Luciferin, anesthetised with Isoflurane, and imaged using the IVIS 100 imaging system. Mice begin treatment with Didox upon detection of clear signal. The animals are treated with daily administrations of Didox (NSC-324360) at 425 mg/kg Didox by intraperitoneal injection (IP) for 5 days. Control animals receive 5% dextrose water by IP injection. Repeat imaging is performed on the day following the final treatment[2].

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

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    Didox Related Classifications

    Help & FAQs
    • Do most proteins show cross-species activity?

      Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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