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

MedKoo CAT#: 202510

CAS#: 501948-05-6

Description: Rosabulin ( STA-5312) is a novel microtubule inhibitor with a distinct binding site from other agents such as vincristine, colchicine, or paclitaxel, which has demonstrated antitumor activity against a range of solid tumors in chemotherapy-resistant cancer. Phase I study showed that STA-5312 appears to be well tolerated when given weekly in doses up to 32mg/m2. The MTD has not been determined and enrollment is ongoing. (source:

Chemical Structure

CAS# 501948-05-6

Theoretical Analysis

MedKoo Cat#: 202510
Name: Rosabulin
CAS#: 501948-05-6
Chemical Formula: C22H16N4O2S
Exact Mass: 400.0994
Molecular Weight: 400.45
Elemental Analysis: C, 65.98; H, 4.03; N, 13.99; O, 7.99; S, 8.01

Size Price Shipping out time Quantity
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Pricing updated 2021-02-26. Prices are subject to change without notice.

Rosabulin 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.

Synonym: STA5312;

IUPAC/Chemical Name: 3-[(4-Cyanophenyl)methyl]-N-(3-methyl-5-isothiazolyl)-alpha-oxo-1-indolizineacetamide


InChi Code: InChI=1S/C22H16N4O2S/c1-14-10-20(29-25-14)24-22(28)21(27)18-12-17(26-9-3-2-4-19(18)26)11-15-5-7-16(13-23)8-6-15/h2-10,12H,11H2,1H3,(H,24,28)

SMILES Code: O=C(NC1=CC(C)=NS1)C(C2=C3C=CC=CN3C(CC4=CC=C(C#N)C=C4)=C2)=O

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

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:

Handling Instructions:

Preparing Stock Solutions

The following data is based on the product molecular weight 400.45 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Select a batch to recalculate based on the batch molecular weight:
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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*When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and SDS / CoA (available online).

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 1: Chen G, Wang ZQ, Jia JM. Three minor novel triterpenoids from the leaves of Diospyros kaki. Chem Pharm Bull (Tokyo). 2009 May;57(5):532-5. PubMed PMID: 19420791.

2: Park JC, Kim SC, Choi MR, Song SH, Yoo EJ, Kim SH, Miyashiro H, Hattori M. Anti-HIV protease activity from rosa family plant extracts and rosamultin from Rosa rugosa. J Med Food. 2005 Spring;8(1):107-9. PubMed PMID: 15857219.

3: Cheol Park J, Chul Kim S, Moon Hur J, Choi SH, Yeon Lee K, Won Choi J. Anti-hepatotoxic effects of Rosa rugosa root and its compound, rosamultin, in rats intoxicated with bromobenzene. J Med Food. 2004 Winter;7(4):436-41. PubMed PMID: 15671686.

4: Jung HJ, Nam JH, Choi J, Lee KT, Park HJ. 19Alpha-hydroxyursane-type triterpenoids: antinociceptive anti-inflammatory principles of the roots of Rosa rugosa. Biol Pharm Bull. 2005 Jan;28(1):101-4. PubMed PMID: 15635171.

5: Cho EJ, Yokozawa T, Rhyu DY, Kim HY, Shibahara N, Park JC. The inhibitory effects of 12 medicinal plants and their component compounds on lipid peroxidation. Am J Chin Med. 2003;31(6):907-17. PubMed PMID: 14992543.

6: Lu X, Xu W, Shen J, Han G. [Chemical studies on Campylotropis hirtella (Franch. Schindl.)]. Zhongguo Zhong Yao Za Zhi. 1997 Nov;22(11):680-2, 704. Chinese. PubMed PMID: 11243186.

7: Rücker G, Mayer R, Shin-Kim JS. [Triterpene saponins from the Chinese drug "Daxueteng" (Caulis sargentodoxae)]. Planta Med. 1991 Oct;57(5):468-70. German. PubMed PMID: 1798803.

8: Wang XY. [Effects of constituents of the roots of Rosa multiflora on hyperlipemia]. Zhong Yao Tong Bao. 1986 Jun;11(6):55-6. Chinese. PubMed PMID: 2948697.

Additional Information

STA-5312, 2-[3-(4-cyano-benzyl)-indolizin-1-yl]-N-(3-methyl-isothiazol-5-yl)-2-oxo-acetamide, is a new chemical entity being developed for the treatment of chemotherapy-resistant tumors. STA-5312 demonstrates substantial anti-proliferative activity against a wide range of cancer cell linesin vitro, with IC50 values extending down into the nanomolar range. The in vitro cytotoxic effects have been demonstrated across a wide array of tumor types, including hematologic and solid tumor cell lines of various origins (e.g. leukemia, lymphoma, breast, colon, uterine). Cell lines with multi-drug resistant (MDR) phenotypes were similarly sensitive to STA-5312. The mechanism of action for STA-5312 is inhibition of microtubule assembly and subsequent arrest of the cell cycle. STA-5312 is active against several tumor cell lines that express moderate to high levels of P-glycoprotein (Pgp), including lines insensitive to Taxol, Vincristine, and Adriamycin in which Pgp activity is a major contributor to the MDR phenotype. When dosed orally or intravenously, STA-5312 has shown in vivo activity in several murine tumors as well as human tumor xenograft models, including drug resistant tumors. Data on the murine leukemia P388 suggested activity in a vincristine-resistant cell line, and data in the RL human Lymphoma cell line suggested an additive effect of Taxol plus STA-5312. Thus, STA-5312 is a potential new therapy for the treatment of cancer including chemoresistant tumors. Considering the breadth of antitumor activity demonstrated by STA-5312 both in vitro and in vivo, two lines of clinical investigation are envisioned encompassing both hematologic and solid tumors. see: Synta Pharmaceuticals Corp's meeting abstract.
STA-5312 inhibits microtubule function, critical to cancer cell proliferation, through a unique binding site. Ongoing phase 1 studies of STA- 5312 in hematological and solid tumor malignancies are expected to be completed in the first half of 2006. The study findings will guide future clinical investment decisions for the compound.