≥98% (HPLC)

5-Azacitidine, 4-Amino-1-(β-D-ribofuranosyl)-1,3,5-triazin-2(1H)-one, Ladakamycin
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


≥98% (HPLC)


226-232 °C (dec.) (lit.)

Mode of action

DNA synthesis | interferes

antibiotic activity spectrum




storage temp.


SMILES string




InChI key


Gene Information

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General description

5-Azacytidine is a chemical analog of cytidine. It functions as a hypomethylating agent. 5-Azacytidine is used to treat myelodysplastic syndrome (MDS).
Chemical structure: nucleoside


5-Azacytidine has been used:
  • for cell induction
  • to study its effects on bovine fetal mesenchymal stem cells (bfMSC)
  • to study its effects on human bone marrow stromal cells (hBMSCs)
  • to study its effects on and DNA methyltransferase 1 (DNMT1) and Ras protein activator like 1 (RASAL1) expression
  • to interfere with DNA methylation and histone acetylation
  • to determine its effects on the conversion of control fibroblasts
  • for optical coherence tomography (OCT) and fluorescein angiography (FA)
  • for the reactivation of Sal-like protein (SALL)3 expression


100, 250 mg in poly bottle
1 g in poly bottle

Biochem/physiol Actions

A potent growth inhibitor and cytotoxic agent; inhibits DNA methyltransferase, an important regulatory mechanism of gene expression, gene activation and silencing.
Causes DNA demethylation or hemi-demethylation, creating openings that allow transcription factors to bind to DNA and reactivate tumor suppressor genes.
5-Azacytidine (Aza-CR) acts as a potential chemotherapeutic regimen for acute myelogenous leukemia. This drug has an ability to selectively increase γ-globin synthesis. Therefore, 5-azacytidine is used in treating severe β-thalassemia. Aza-CR acts as a potential bacteriostatic, antitumor and mutagenic agent. In addition, it also exhibits various biological activity such as, immunosuppressive, antimitotic, radioprotective and virostatic effects.

Features and Benefits

This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC

Signal Word


Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Certificate of Analysis

Certificate of Origin

  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  4. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. What is the solution stability of Product No. A2385? That is, how should I store solutions of 5-Azacytidine?

    We generally don't recommend storing solutions, since it has such poor solution stability. In Cancer Res., 61, 6331-6334 (2001), A. Chetcuti et al. describe preparing a 5 micromolar working concentration from a 5 Molar freshly prepared stock solution in DMSO.

  6. What is Product No. A2385 (5-Azacytidine) used for?

    This nucleoside analog has been used variously as an antitumor agent and as a mutagenic agent.

  7. I need to perform an identity test on Product No. A2385 (5-Azacytidine). What would you recommend?

    This means that each lot is tested according to the list of tests (left hand column), and must meet or exceed the specifications (right hand column). HPLC. The elemental analyses for carbon and nitrogen content are identity tests (albeit not absolutely conclusive identity tests). I would say that the HPLC, using a previous lot of A2385 as a control sample, provides the best evidence for identity and purity.

  8. I just need to perform a purity assay on Product No. A2385 (5-Azacytidine). What would you recommend?

    We assay the purity of this product by HPLC. If you would like to obtain a copy of our HPLC parameters/method, please contact your local Sigma-Aldrich Technical Service group.

  9. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

  10. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Functional striated muscle cells from non-myoblast precursors following 5-azacytidine treatment
Constantinides PG, et al.
Nature, 267(5609), 364-364 (1977)
Myogenic differentiation potential of mesenchymal stem cells derived from fetal bovine bone marrow
Okamura LH, et al.
Animal Biotechnology, 29(1), 1-11 (2018)
Dexamethasone regulates EphA5, a potential inhibitory factor with osteogenic capability of human bone marrow stromal cells
Yamada T, et al.
Stem Cells International, 2016 (2016)
Enhanced conversion of induced neuronal cells (iN cells) from human fibroblasts: utility in uncovering cellular deficits in mental illness-associated chromosomal abnormalities
Passeri E, et al.
Neuroscience Research, 101, 57-61 (2015)
5-Azacytidine in the Treatment of Intermediate-2 and High-risk Myelodysplastic Syndromes and Acute Myeloid Leukemia. A Five-year Experience with 44 Consecutive Patients.
Diamantopoulos P, et al.
Anticancer Research, 35(9), 5141-5147 (2015)
Cancer research has revealed that the classical model of carcinogenesis, a three step process consisting of initiation, promotion, and progression, is not complete.
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