≥99% (TLC), powder

[5-(2-Thienylcarbonyl)-1H-benzimidazol-2-yl]-carbamic acid methyl ester, Methyl N-(5-thenoyl-2-benzimidazolyl)carbamate, R 17934, Methyl [5-(2-thienylcarbonyl)-1H-benzimidazol-2-yl]carbamate, Oncodazole
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


≥99% (TLC)




300 °C (dec.)


DMSO: soluble 10 mg/mL (may require heating)
H2O: insoluble

storage temp.


SMILES string




InChI key


Gene Information

human ... TUBB(203068)

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2, 10, 50 mg in glass bottle


Nocodazole has been shown to enhance CRISPR genome editing efficiency. To see other small molecule CRISPR enhancers, visit sigma.com/CRISPR-enhancers.

Biochem/physiol Actions

Nocodazole is an antimitotic agent that disrupts microtubules by binding to β−tubulin and preventing formation of one of the two interchain disulfide linkages, thus inhibiting microtubule dynamics, disruption of mitotic spindle function, and fragmentation of the Golgi complex. Nocodazole arrests the cell cycle at G2/M phase and also prevents phosphorylation of the T cell antigen receptor and inhibits its activity. Nocodazole stimulates the intrinsic GTPase activity of tubulin and activates the JNK/SAPK signaling pathway and induces apoptosis in several normal and tumor cell lines. Nocodazole has been shown to enhance CRISPR homology-directed repair (HDR) efficiency and increase Cas9-mediated editing frequencies.

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.

Physical form

Color white to faint yellow and pink

Legal Information

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


Health hazard

Signal Word


Hazard Statements

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Muralidharan Mani et al.
Biochimica et biophysica acta. Molecular cell research, 1866(9), 1463-1474 (2019-06-15)
The perinuclear stacks of the Golgi apparatus maintained by dynamic microtubules are essential for cell migration. Activation of Akt (protein kinase B, PKB) negatively regulates glycogen synthase kinase 3β (GSK3β)-mediated tau phosphorylation, which enhances tau binding to microtubules and microtubule...
Kristian Jeppsson et al.
PLoS genetics, 10(10), e1004680-e1004680 (2014-10-21)
The cohesin complex, which is essential for sister chromatid cohesion and chromosome segregation, also inhibits resolution of sister chromatid intertwinings (SCIs) by the topoisomerase Top2. The cohesin-related Smc5/6 complex (Smc5/6) instead accumulates on chromosomes after Top2 inactivation, known to lead...
Yuanming Cheng et al.
Cell reports, 28(7), 1703-1716 (2019-08-15)
Stem cells balance cellular fates through asymmetric and symmetric divisions in order to self-renew or to generate downstream progenitors. Symmetric commitment divisions in stem cells are required for rapid regeneration during tissue damage and stress. The control of symmetric commitment remains...
Alessandra Pisciottani et al.
Cells, 8(7) (2019-07-10)
Abscission is the final step of cell division, mediating the physical separation of the two daughter cells. A key player in this process is the microtubule-severing enzyme spastin that localizes at the midbody where its activity is crucial to cut...
Shunsuke Ishii et al.
Scientific reports, 9(1), 11635-11635 (2019-08-14)
Lysosomes are largely responsible for significant degradation of intracellular and extracellular proteins via the secretory pathway, autophagy, and endocytosis. Therefore, dysregulation of lysosomal homeostasis influences diverse cellular functions. However, a straightforward and quantitative method to measure the integrity of the...
The CRISPR-Cas9 system is an RNA-guided genome-editing tool that provides researchers a simple, easy, and quick way to modify the genomes of various organisms.
Read More
High titer lentiviral particles including beta-actin, alpha-tubulin and vimentin used for live cell analysis of cytoskeleton structure proteins.
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