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  • 324623 - Eg5 Inhibitor IV, VS-83 - CAS 909250-29-9 - Calbiochem

324623 Millipore

Eg5 Inhibitor IV, VS-83 - CAS 909250-29-9 - Calbiochem

The Eg5 Inhibitor IV, VS-83, also referenced under CAS 909250-29-9, controls the biological activity of Eg5. This small molecule/inhibitor is primarily used for Cell Structure applications.

Synonym: 5-Fluoro-3,4-dihydro-4(3ʹ-hydroxyphenyl)quinazoline-2(1H)-thione, Eg5 Inhibitor IV, VS-83 - CAS 909250-29-9 - Calbiochem

  • CAS Number 909250-29-9

  • Empirical Formula (Hill Notation) C14H11FN2OS

  • Molecular Weight 274.31



Quality Level   100
assay   ≥99% (HPLC)
form   solid
mfr. no.   Calbiochem®
storage condition   OK to freeze
  protect from light
storage conditions   -20C
color   white
solubility   ethanol: 5 mg/mL
  DMSO: 50 mg/mL
shipped in   ambient


General description

A cell-permeable Monastrol (Cat. No. 475879) analog with much enhanced potency and selectivity (over 8 other kinesins) in inhibiting mitotic kinesin Eg5-ATPase activity (IC50 = 1.17 vs. 20.73 µM for VS-83 and Monastrol, respectively) and in inducing monoasters formation (EC50 = 7.27 vs. 58.74 µM for BSC-1 cells treated with VS-83 and Monastrol, respectively). Shown to exhibit ≥10-fold antiproliferative activity than Monastrol against U-87 MG, U-118 MG, and U-373 MG glioblastoma cells.


5 mg in Glass bottle

Packaged under inert gas


Toxicity: Regulatory Review (Z)


Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.

Other Notes

Muller, C., et al. 2007. Cancer Chemother. Pharmacol.59, 157.
Santamaria, A., et al. 2007. Mol. Biol. Cell18, 4024.
Sarli, V., et al. 2005. ChemBioChem6, 2005.

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