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MedKoo CAT#: 205748

CAS#: 917111-44-5

Description: Lexibulin, also known as CYT997, is a n orally bioavailable small-molecule with tubulin-inhibiting, vascular-disrupting, and potential antineoplastic activities. Lexibulin inhibits tubulin polymerization in tumor blood vessel endothelial cells and tumor cells, blocking the formation of the mitotic spindle and leading to cell cycle arrest at the G2/M phase; this may result in disruption of the tumor vasculature and tumor blood flow, and tumor cell death.

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 750 2 Weeks
200mg USD 1050 2 Weeks
500mg USD 1850 2 Weeks
1g USD 2750 2 Weeks
2g USD 4250 2 Weeks
5g USD 6450 2 Weeks
Inquire bulk and customized quantity

Pricing updated 2020-08-08. Prices are subject to change without notice.

Lexibulin, purity > 98%, is in stock. The same day shipping out after order is received. Note: the estimated shipping out time for order > 500mg may be 2 weeks.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 205748
Name: Lexibulin
CAS#: 917111-44-5
Chemical Formula: C24H30N6O2
Exact Mass: 434.24302
Molecular Weight: 434.534
Elemental Analysis: C, 66.34; H, 6.96; N, 19.34; O, 7.36

Synonym: CYT997; CYT-997; CYT 997. lexibulin.

IUPAC/Chemical Name: (S)-1-ethyl-3-(2-methoxy-4-(5-methyl-4-((1-(pyridin-3-yl)butyl)amino)pyrimidin-2-yl)phenyl)urea


InChi Code: InChI=1S/C24H30N6O2/c1-5-8-19(18-9-7-12-25-15-18)28-22-16(3)14-27-23(30-22)17-10-11-20(21(13-17)32-4)29-24(31)26-6-2/h7,9-15,19H,5-6,8H2,1-4H3,(H2,26,29,31)(H,27,28,30)/t19-/m0/s1


Technical Data

white solid powder

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

Certificate of Analysis:

Safety Data Sheet (SDS):

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:

Additional Information

Phase I study of Lexibulin (CYT997): Thirty-one patients received CYT997 over 12 dose levels (7-358 mg m(-2)). Doses up to 202 mg m(-2) were well tolerated. Dose-limiting toxicities were observed at 269 and 358 mg m(-2), consisting of grade 3 prolonged corrected QT interval in two patients and grade 3 hypoxia and grade 4 dyspnea in one patient. All toxicities were reversible. The pharmacokinetics of CYT997 were linear over the entire dose range. Dynamic contrast-enhanced magnetic resonance imaging scans showed significant changes in tumour K(trans) values consistent with vascular disruption in 7 out of 11 evaluable patients treated at CYT997 doses of >or=65 mg m(-2). Moreover, plasma levels of von Willebrand factor and caspase-cleaved cytokeratin-18 increased post-treatment at higher dose levels. Among 22 patients evaluable for response, 18 achieved stable disease for >2 cycles. CONCLUSIONS:  CYT997 was well tolerated at doses that were associated with pharmacodynamic evidence of vascular disruption in tumours.  (source: Br J Cancer. 2010 Aug 24;103(5):597-606.)


1: Chen X, Yang C, Xu Y, Zhou H, Liu H, Qian W. The microtubule depolymerizing agent CYT997 effectively kills acute myeloid leukemia cells via activation of caspases and inhibition of PI3K/Akt/mTOR pathway proteins. Exp Ther Med. 2013 Aug;6(2):299-304. Epub 2013 Jun 14. PubMed PMID: 24137178; PubMed Central PMCID: PMC3786882.

2: Burge M, Francesconi AB, Kotasek D, Fida R, Smith G, Wilks A, Vasey PA, Lickliter JD. Phase I, pharmacokinetic and pharmacodynamic evaluation of CYT997, an orally-bioavailable cytotoxic and vascular-disrupting agent. Invest New Drugs. 2013 Feb;31(1):126-35. doi: 10.1007/s10637-012-9813-y. Epub 2012 Mar 27. PubMed PMID: 22451157.

3: Burns CJ, Fantino E, Powell AK, Shnyder SD, Cooper PA, Nelson S, Christophi C, Malcontenti-Wilson C, Dubljevic V, Harte MF, Joffe M, Phillips ID, Segal D, Wilks AF, Smith GD. The microtubule depolymerizing agent CYT997 causes extensive ablation of tumor vasculature in vivo. J Pharmacol Exp Ther. 2011 Dec;339(3):799-806. doi: 10.1124/jpet.111.186965. Epub 2011 Sep 14. PubMed PMID: 21917561.

4: Lickliter JD, Francesconi AB, Smith G, Burge M, Coulthard A, Rose S, Griffin M, Milne R, McCarron J, Yeadon T, Wilks A, Cubitt A, Wyld DK, Vasey PA. Phase I trial of CYT997, a novel cytotoxic and vascular-disrupting agent. Br J Cancer. 2010 Aug 24;103(5):597-606. doi: 10.1038/sj.bjc.6605841. PubMed PMID: 20733579; PubMed Central PMCID: PMC2938266.

5: Monaghan K, Khong T, Smith G, Spencer A. CYT997 causes apoptosis in human multiple myeloma. Invest New Drugs. 2011 Apr;29(2):232-8. doi: 10.1007/s10637-009-9350-5. Epub 2009 Nov 12. PubMed PMID: 19907921.

6: Burns CJ, Fantino E, Phillips ID, Su S, Harte MF, Bukczynska PE, Frazzetto M, Joffe M, Kruszelnicki I, Wang B, Wang Y, Wilson N, Dilley RJ, Wan SS, Charman SA, Shackleford DM, Fida R, Malcontenti-Wilson C, Wilks AF. CYT997: a novel orally active tubulin polymerization inhibitor with potent cytotoxic and vascular disrupting activity in vitro and in vivo. Mol Cancer Ther. 2009 Nov;8(11):3036-45. doi: 10.1158/1535-7163.MCT-09-0076. Epub 2009 Nov 3. PubMed PMID: 19887548.

7: Burns CJ, Harte MF, Bu X, Fantino E, Joffe M, Sikanyika H, Su S, Tranberg CE, Wilson N, Charman SA, Shackleford DM, Wilks AF. Discovery of CYT997: a structurally novel orally active microtubule targeting agent. Bioorg Med Chem Lett. 2009 Aug 15;19(16):4639-42. doi: 10.1016/j.bmcl.2009.06.079. Epub 2009 Jun 25. PubMed PMID: 19616947.