Palbociclib Isethionate

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

MedKoo CAT#: 106610

CAS#: 827022-33-3 (isethionate)

Description: Palbociclib, also known as PD0332991, is an orally available pyridopyrimidine-derived cyclin-dependent kinase (CDK) inhibitor with potential antineoplastic activity. PD-0332991 selectively inhibits cyclin-dependent kinases (particularly Cdk4/cyclin D1 kinase), which may inhibit retinoblastoma (Rb) protein phosphorylation; inhibition of Rb phosphorylation prevents Rb-positive tumor cells from entering the S phase of the cell cycle (arrest in the G1 phase), resulting in suppression of DNA replication and decreased tumor cell proliferation. PD 0332991 is a highly specific inhibitor of cyclin-dependent kinase 4 (Cdk4) (IC50 = 0.011 μmol/L) and Cdk6 (IC50 = 0.016 μmol/L), having no activity against a panel of 36 additional protein kinases. Isethionate was approved on 2/3/2015 for treatment of advanced (metastatic) breast cancer.

Price and Availability


USD 450
USD 2250

USD 750
USD 3650

USD 1250
USD 6650

Palbociclib Isethionate, 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#: 106610
Name: Palbociclib Isethionate
CAS#: 827022-33-3 (isethionate)
Chemical Formula: C26H35N7O6S
Exact Mass:
Molecular Weight: 573.67
Elemental Analysis: C, 54.44; H, 6.15; N, 17.09; O, 16.73; S, 5.59

Related CAS #: 571190-30-2 (free base)   827022-32-2 (HCl)   827022-33-3 (isethionate)   Unknown (Palbociclib-SMCC)    

Synonym: PD 0332991; PD-0332991; PD0332991; PD0332991; PD332991; PD-332991; PD 332991; Palbociclib Isethionate, brand name: Ibrance

IUPAC/Chemical Name: 6-acetyl-8-cyclopentyl-5-methyl-2-((5-(piperazin-1-yl)pyridin-2-yl)amino)pyrido[2,3-d]pyrimidin-7(8H)-one 2-hydroxyethane-1-sulfonate


InChi Code: InChI=1S/C24H29N7O2.C2H6O4S/c1-15-19-14-27-24(28-20-8-7-18(13-26-20)30-11-9-25-10-12-30)29-22(19)31(17-5-3-4-6-17)23(33)21(15)16(2)32;3-1-2-7(4,5)6/h7-8,13-14,17,25H,3-6,9-12H2,1-2H3,(H,26,27,28,29);3H,1-2H2,(H,4,5,6)


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).

Harmonized System Code:


1: L'Allemain G. [Doubling time of progression-free survival by palbociclib in metastatic breast cancer]. Bull Cancer. 2015 Apr;102(4):300. doi: 10.1016/j.bulcan.2015.02.011. French. PubMed PMID: 26042255.

2: Palbociclib Extends Survival in Advanced Breast Cancer. Cancer Discov. 2015 Jun 2. [Epub ahead of print] PubMed PMID: 26036642.

3: Turner NC, Ro J, André F, Loi S, Verma S, Iwata H, Harbeck N, Loibl S, Huang Bartlett C, Zhang K, Giorgetti C, Randolph S, Koehler M, Cristofanilli M. Palbociclib in Hormone-Receptor-Positive Advanced Breast Cancer. N Engl J Med. 2015 Jun 1. [Epub ahead of print] PubMed PMID: 26030518.

4: Niesvizky R, Badros AZ, Costa LJ, Ely SA, Singhal SB, Stadtmauer EA, Haideri NA, Yacoub A, Hess G, Lentzsch S, Spicka I, Chanan-Khan AA, Raab MS, Tarantolo S, Vij R, Zonder JA, Huang X, Jayabalan D, Di Liberto M, Huang X, Jiang Y, Kim ST, Randolph S, Chen-Kiang S. Phase 1/2 study of cyclin-dependent kinase (CDK)4/6 inhibitor palbociclib (PD-0332991) with bortezomib and dexamethasone in relapsed/refractory multiple myeloma. Leuk Lymphoma. 2015 May 15:1-9. [Epub ahead of print] PubMed PMID: 25813205.

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7: Vaughn DJ, Hwang WT, Lal P, Rosen MA, Gallagher M, O'Dwyer PJ. Phase 2 trial of the cyclin-dependent kinase 4/6 inhibitor palbociclib in patients with retinoblastoma protein-expressing germ cell tumors. Cancer. 2015 May 1;121(9):1463-8. doi: 10.1002/cncr.29213. Epub 2014 Dec 18. PubMed PMID: 25522918.

8: DeMichele A, Clark AS, Tan KS, Heitjan DF, Gramlich K, Gallagher M, Lal P, Feldman M, Zhang P, Colameco C, Lewis D, Langer M, Goodman N, Domchek S, Gogineni K, Rosen M, Fox K, O'Dwyer P. CDK 4/6 inhibitor palbociclib (PD0332991) in Rb+ advanced breast cancer: phase II activity, safety, and predictive biomarker assessment. Clin Cancer Res. 2015 Mar 1;21(5):995-1001. doi: 10.1158/1078-0432.CCR-14-2258. Epub 2014 Dec 11. PubMed PMID: 25501126.

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10: Schultz KA, Petronio J, Bendel A, Patterson R, Vaughn DJ. PD0332991 (Palbociclib) for treatment of pediatric intracranial growing teratoma syndrome. Pediatr Blood Cancer. 2015 Jun;62(6):1072-4. doi: 10.1002/pbc.25338. Epub 2014 Nov 21. PubMed PMID: 25417786.

11: de Melo-Diogo D, Gaspar VM, Costa EC, Moreira AF, Oppolzer D, Gallardo E, Correia IJ. Combinatorial delivery of Crizotinib-Palbociclib-Sildenafil using TPGS-PLA micelles for improved cancer treatment. Eur J Pharm Biopharm. 2014 Nov;88(3):718-29. doi: 10.1016/j.ejpb.2014.09.013. Epub 2014 Oct 13. PubMed PMID: 25308930.

12: Cadoo KA, Gucalp A, Traina TA. Palbociclib: an evidence-based review of its potential in the treatment of breast cancer. Breast Cancer (Dove Med Press). 2014 Aug 4;6:123-33. doi: 10.2147/BCTT.S46725. eCollection 2014. Review. PubMed PMID: 25177151; PubMed Central PMCID: PMC4128689.

13: Pauls E, Badia R, Torres-Torronteras J, Ruiz A, Permanyer M, Riveira-Muñoz E, Clotet B, Marti R, Ballana E, Esté JA. Palbociclib, a selective inhibitor of cyclin-dependent kinase4/6, blocks HIV-1 reverse transcription through the control of sterile α motif and HD domain-containing protein-1 (SAMHD1) activity. AIDS. 2014 Sep 24;28(15):2213-22. doi: 10.1097/QAD.0000000000000399. PubMed PMID: 25036183.

14: Palbociclib ups PFS in HER2-/ER+ breast cancer. Cancer Discov. 2014 Jun;4(6):624-5. doi: 10.1158/2159-8290.CD-NB2014-053. Epub 2014 Apr 6. PubMed PMID: 24891344.

15: Rocca A, Farolfi A, Bravaccini S, Schirone A, Amadori D. Palbociclib (PD 0332991) : targeting the cell cycle machinery in breast cancer. Expert Opin Pharmacother. 2014 Feb;15(3):407-20. doi: 10.1517/14656566.2014.870555. Epub 2013 Dec 26. Review. PubMed PMID: 24369047.