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

MedKoo CAT#: 204430

CAS#: 1095253-39-6

Description: ARQ-621 is an allosteric, potent and selective inhibitor of Eg5, a microtubule-based ATPase motor protein involved in cell division. Over-expression of Eg5 causes genomic instability and tumor formation in mice; therefore, Eg5 is a potential anti-cancer target. Preclinical data shows anti-tumor activity of ARQ 621 across a wide range of cell lines from human solid and hematological malignancies.

Price and Availability




ARQ-621, is not in stock, may be available through custom synthesis. For cost-effective reason, minimum 1 gram order is requested. The product will be characterized by NMR, HPLC and MS analysis. Purity (HPLC) is usually >98%. CoA, QC data, MSDS will be provided when product is successfully made. The estimated lead time is 2-3 months. Please send email to to inquire quote.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 204430
Name: ARQ-621
CAS#: 1095253-39-6
Chemical Formula: C28H24Cl2FN5O2
Exact Mass: 551.12911
Molecular Weight: 552.42686
Elemental Analysis: C, 60.88; H, 4.38; Cl, 12.84; F, 3.44; N, 12.68; O, 5.79

Synonym: ARQ621; ARQ 621; ARQ-621.

IUPAC/Chemical Name: (R)-N-(3-aminopropyl)-3-chloro-N-(1-(7-chloro-4-oxo-3-(phenylamino)-3,4-dihydroquinazolin-2-yl)but-3-yn-1-yl)-2-fluorobenzamide


InChi Code: InChI=1S/C28H24Cl2FN5O2/c1-2-8-24(35(16-7-15-32)27(37)21-11-6-12-22(30)25(21)31)26-33-23-17-18(29)13-14-20(23)28(38)36(26)34-19-9-4-3-5-10-19/h1,3-6,9-14,17,24,34H,7-8,15-16,32H2/t24-/m1/s1

SMILES Code: O=C(N(CCCN)[C@@H](C(N1NC2=CC=CC=C2)=NC3=C(C=CC(Cl)=C3)C1=O)CC#C)C4=CC=CC(Cl)=C4F

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:
>5 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).

Harmonized System Code:

Additional Information



1: Rath O, Kozielski F. Kinesins and cancer. Nat Rev Cancer. 2012 Jul 24;12(8):527-39. doi: 10.1038/nrc3310. Review. PubMed PMID: 22825217.