WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 407309

CAS#: 72926-24-0

Description: K-858 is a novel inhibitor of mitotic kinesin Eg5 and antitumor agent, induces cell death in cancer cells. K858 blocked centrosome separation, activated the spindle checkpoint, and induced mitotic arrest in cells accompanied by the formation of monopolar spindles. Long-term continuous treatment of cancer cells with K858 resulted in antiproliferative effects through the induction of mitotic cell death, and polyploidization followed by senescence. K858 exhibited potent antitumor activity in xenograft models of cancer, and induced the accumulation of mitotic cells with monopolar spindles in tumor tissues.

Price and Availability

Size Price Shipping out time Quantity
10mg USD 150 2 Weeks
25mg USD 250 2 Weeks
50mg USD 450 2 Weeks
100mg USD 650 2 Weeks
200mg USD 850 2 Weeks
500mg USD 1850 2 Weeks
1g USD 2950 2 Weeks
2g USD 3950 2 Weeks
5g USD 6550 2 Weeks
Inquire bulk and customized quantity

Pricing updated 2021-01-26. Prices are subject to change without notice.

K-858, purity > 98%, is in stock. Current shipping out time is about 2 weeks after order is received. CoA, QC data and MSDS documents are available in one week after order is received.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 407309
Name: K-858
CAS#: 72926-24-0
Chemical Formula: C13H15N3O2S
Exact Mass: 277.0885
Molecular Weight: 277.342
Elemental Analysis: C, 56.30; H, 5.45; N, 15.15; O, 11.54; S, 11.56

Synonym: K-858; K 858; K858.

IUPAC/Chemical Name: N-(4-acetyl-5-methyl-5-phenyl-4,5-dihydro-1,3,4-thiadiazol-2-yl)acetamide


InChi Code: InChI=1S/C13H15N3O2S/c1-9(17)14-12-15-16(10(2)18)13(3,19-12)11-7-5-4-6-8-11/h4-8H,1-3H3,(H,14,15,17)

SMILES Code: CC(NC1=NN(C(C)=O)C(C2=CC=CC=C2)(C)S1)=O

Technical Data

Solid powder

>98% (or refer to the Certificate of Analysis)

Shipping Condition:
Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition:
Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Soluble in DMSO, not in water

Shelf Life:
>2 years if stored properly

Drug Formulation:
This drug may be formulated in DMSO

Stock Solution Storage:
0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code:


1: Indorato RL, DeBonis S, Kozielski F, Garcia-Saez I, Skoufias DA.
STLC-resistant cell lines as tools to classify chemically divergent Eg5 targeting
agents according to their mode of action and target specificity. Biochem
Pharmacol. 2013 Nov 15;86(10):1441-51. doi: 10.1016/j.bcp.2013.09.003. Epub 2013
Sep 13. PubMed PMID: 24041742.

2: Nakai R, Iida S, Takahashi T, Tsujita T, Okamoto S, Takada C, Akasaka K,
Ichikawa S, Ishida H, Kusaka H, Akinaga S, Murakata C, Honda S, Nitta M, Saya H,
Yamashita Y. K858, a novel inhibitor of mitotic kinesin Eg5 and antitumor agent,
induces cell death in cancer cells. Cancer Res. 2009 May 1;69(9):3901-9. doi:
10.1158/0008-5472.CAN-08-4373. Epub 2009 Apr 7. PubMed PMID: 19351824.