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MedKoo CAT#: 201436

CAS#: 805242-85-7

Description: GPI-15427 is a potent PARP-1 inhibitor capable of crossing the blood-brain barrier, which can significantly increased the antitumor activity of the methylating agent TMZ against malignant melanoma, glioblastoma multiforme, or lymphoma growing at the CNS site. GPI-15427 acts as a potent inhibitor of the enzyme, being capable of inhibiting the activity of purified PARP-1 at nanomolar concentrations. GPI-15427 induced significant sensitization to radiotherapy, representing a promising new treatment in the management of HNSCC.

Price and Availability

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Pricing updated 2020-09-20. Prices are subject to change without notice.

GPI-15427 is not in stock, but is 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#: 201436
Name: GPI-15427
CAS#: 805242-85-7
Chemical Formula: C20H20N4O2
Exact Mass: 348.15863
Molecular Weight: 348.4
Elemental Analysis: C, 68.95; H, 5.79; N, 16.08; O, 9.18

Synonym: GPI15427; GPI 15427; GPI-15427.

IUPAC/Chemical Name: 10-((4-methylpiperazin-1-yl)methyl)chromeno[4,3,2-de]phthalazin-3(2H)-one.


InChi Code: InChI=1S/C20H20N4O2/c1-23-7-9-24(10-8-23)12-13-5-6-16-15(11-13)19-18-14(20(25)22-21-19)3-2-4-17(18)26-16/h2-6,11H,7-10,12H2,1H3,(H,22,25)


Technical Data

Solid powder


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).

HS Tariff Code:

Additional Information

GPI 15427 + radiation significantly reduced tumor volume compared to vehicle treated mice and mice treated with GPI 15427 alone or mice treated with radiation alone. In conclusion, these data indicate that iv administration of the PARP inhibitor GPI 15427 is well tolerated and induces significant enhancement of radiation anti-tumor efficacy against human head and neck cancer. (source:


1: Khan K, Araki K, Wang D, Li G, Li X, Zhang J, Xu W, Hoover RK, Lauter S, O'Malley B Jr, Lapidus RG, Li D. Head and neck cancer radiosensitization by the novel poly(ADP-ribose) polymerase inhibitor GPI-15427. Head Neck. 2010 Mar;32(3):381-91. doi: 10.1002/hed.21195. PubMed PMID: 19672867.

2: Di Paola R, Mazzon E, Xu W, Genovese T, Ferrraris D, Muià C, Crisafulli C, Zhang J, Cuzzocrea S. Treatment with PARP-1 inhibitors, GPI 15427 or GPI 16539, ameliorates intestinal damage in rat models of colitis and shock. Eur J Pharmacol. 2005 Dec 19;527(1-3):163-71. Epub 2005 Nov 28. PubMed PMID: 16310767.

3: Tentori L, Leonetti C, Scarsella M, Vergati M, Xu W, Calvin D, Morgan L, Tang Z, Woznizk K, Alemu C, Hoover R, Lapidus R, Zhang J, Graziani G. Brain distribution and efficacy as chemosensitizer of an oral formulation of PARP-1 inhibitor GPI 15427 in experimental models of CNS tumors. Int J Oncol. 2005 Feb;26(2):415-22. PubMed PMID: 15645126.

4: Tentori L, Leonetti C, Scarsella M, D'Amati G, Vergati M, Portarena I, Xu W, Kalish V, Zupi G, Zhang J, Graziani G. Systemic administration of GPI 15427, a novel poly(ADP-ribose) polymerase-1 inhibitor, increases the antitumor activity of temozolomide against intracranial melanoma, glioma, lymphoma. Clin Cancer Res. 2003 Nov 1;9(14):5370-9. PubMed PMID: 14614022.