NBQX free acid

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

MedKoo CAT#: 555701

CAS#: 118876-58-7 (free acid)

Description: NBQX, also known as FG9202, is an AMPA receptor antagonist. NBQX blocks AMPA receptors in micromolar concentrations (~10–20 µM) and also blocks kainate receptors. In experiments, it is used to counter glutamate excitotoxicity. NBQX was found to have anticonvulsant activity in rodent seizure models. As the disodium salt, NBQX is soluble in water at high concentrations (at least up to 100 mM).

Price and Availability

Size Price Shipping out time Quantity
50mg USD 850 2 Weeks
100mg USD 1550 2 Weeks
200mg USD 2150 2 Weeks
500mg USD 2950 2 Weeks
1g USD 3950 2 Weeks
2g USD 6450 2 Weeks
Inquire bulk and customized quantity

Pricing updated 2021-01-25. Prices are subject to change without notice.

NBQX free acid, 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#: 555701
Name: NBQX free acid
CAS#: 118876-58-7 (free acid)
Chemical Formula: C12H8N4O6S
Exact Mass: 336.0165
Molecular Weight: 336.278
Elemental Analysis: C, 42.86; H, 2.40; N, 16.66; O, 28.55; S, 9.53

Related CAS #: 118876-58-7 (free acid)   479347-86-9 sodium)    

Synonym: NBQX free acid; FG9202; FG-9202; FG 9202;

IUPAC/Chemical Name: 6-nitro-2,3-dioxo-1,2,3,4-tetrahydrobenzo[f]quinoxaline-7-sulfonamide


InChi Code: InChI=1S/C12H8N4O6S/c13-23(21,22)8-3-1-2-5-9(8)7(16(19)20)4-6-10(5)15-12(18)11(17)14-6/h1-4H,(H,14,17)(H,15,18)(H2,13,21,22)

SMILES Code: NS(=O)(C1=C2C(C3=C(C=C2[N+]([O-])=O)NC(C(N3)=O)=O)=CC=C1)=O

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

Shelf Life:
>3 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:


1: Getachew B, Tizabi Y. Both Ketamine and NBQX Attenuate Alcohol-Withdrawal Induced Depression in Male Rats. J Drug Alcohol Res. 2019;8. pii: 236069. doi: 10.4303/jdar/236069. PubMed PMID: 31032138; PubMed Central PMCID: PMC6483102.

2: Dannenhoffer CA, Varlinskaya EI, Spear LP. Effects of AMPA receptor antagonist, NBQX, and extrasynaptic GABA(A) agonist, THIP, on social behavior of adolescent and adult rats. Physiol Behav. 2018 Oct 1;194:212-217. doi: 10.1016/j.physbeh.2018.05.024. Epub 2018 May 22. PubMed PMID: 29800636.

3: Ruda-Kucerova J, Babinska Z, Luptak M, Getachew B, Tizabi Y. Both ketamine and NBQX attenuate alcohol drinking in male Wistar rats. Neurosci Lett. 2018 Feb 14;666:175-180. doi: 10.1016/j.neulet.2017.12.055. Epub 2017 Dec 28. PubMed PMID: 29288725; PubMed Central PMCID: PMC5805612.

4: Zhu H, Zhu R, Deng ZD, Feng YC, Shen HL. [Analgesic effects of ionotropic glutamate receptor antagonists MK-801 and NBQX on collagen-induced arthritis rats]. Beijing Da Xue Xue Bao Yi Xue Ban. 2016 Dec 18;48(6):977-981. Chinese. PubMed PMID: 27987500.

5: Chen W, Li YS, Gao J, Lin XY, Li XH. AMPA Receptor Antagonist NBQX Decreased Seizures by Normalization of Perineuronal Nets. PLoS One. 2016 Nov 23;11(11):e0166672. doi: 10.1371/journal.pone.0166672. eCollection 2016. PubMed PMID: 27880801; PubMed Central PMCID: PMC5120819.

6: Libbey JE, Hanak TJ, Doty DJ, Wilcox KS, Fujinami RS. NBQX, a highly selective competitive antagonist of AMPA and KA ionotropic glutamate receptors, increases seizures and mortality following picornavirus infection. Exp Neurol. 2016 Jun;280:89-96. doi: 10.1016/j.expneurol.2016.04.010. Epub 2016 Apr 9. PubMed PMID: 27072529; PubMed Central PMCID: PMC4860063.

7: Twele F, Bankstahl M, Klein S, Römermann K, Löscher W. The AMPA receptor antagonist NBQX exerts anti-seizure but not antiepileptogenic effects in the intrahippocampal kainate mouse model of mesial temporal lobe epilepsy. Neuropharmacology. 2015 Aug;95:234-42. doi: 10.1016/j.neuropharm.2015.03.014. Epub 2015 Mar 31. PubMed PMID: 25839899.

8: Lippman-Bell JJ, Rakhade SN, Klein PM, Obeid M, Jackson MC, Joseph A, Jensen FE. AMPA receptor antagonist NBQX attenuates later-life epileptic seizures and autistic-like social deficits following neonatal seizures. Epilepsia. 2013 Nov;54(11):1922-32. doi: 10.1111/epi.12378. Epub 2013 Oct 1. PubMed PMID: 24117347; PubMed Central PMCID: PMC4262152.

9: Potschka H, Pekcec A, Weinhold B, Gerardy-Schahn R. Deficiency of neural cell adhesion molecule or its polysialylation modulates pharmacological effects of the AMPA receptor antagonist NBQX. Neuroscience. 2008 Apr 9;152(4):1093-8. doi: 10.1016/j.neuroscience.2007.09.027. Epub 2007 Sep 20. PubMed PMID: 18329813.

10: Zbarska S, Bloedel JR, Bracha V. Cerebellar dysfunction explains the extinction-like abolition of conditioned eyeblinks after NBQX injections in the inferior olive. J Neurosci. 2008 Jan 2;28(1):10-20. doi: 10.1523/JNEUROSCI.3403-07.2008. PubMed PMID: 18171918; PubMed Central PMCID: PMC6671149.

11: Lojková D, Zivanović D, Mares P. Different effects of nonNMDA and NMDA receptor antagonists (NBQX and dizocilpine) on cortical epileptic afterdischarges in rats. Brain Res. 2006 Dec 8;1124(1):167-75. Epub 2006 Oct 27. PubMed PMID: 17070784.

12: Kong LL, Yu LC. It is AMPA receptor, not kainate receptor, that contributes to the NBQX-induced antinociception in the spinal cord of rats. Brain Res. 2006 Jul 19;1100(1):73-7. Epub 2006 Jun 13. PubMed PMID: 16777075.

13: Yoon MH, Bae HB, Choi JI, Jeong SW, Chung SS, Yoo KY, Jeong CY, Kim SJ, Chung ST, Kim CM, An TH. Evaluation of interaction between intrathecal adenosine and MK801 or NBQX in a rat formalin pain model. Pharmacology. 2005 Nov;75(3):157-64. Epub 2005 Sep 15. PubMed PMID: 16166819.

14: Yoon MH, Bae HB, Choi JI. Antinociceptive interactions between intrathecal gabapentin and MK801 or NBQX in rat formalin test. J Korean Med Sci. 2005 Apr;20(2):307-12. PubMed PMID: 15832006; PubMed Central PMCID: PMC2808611.

15: Zahn PK, Pogatzki-Zahn EM, Brennan TJ. Spinal administration of MK-801 and NBQX demonstrates NMDA-independent dorsal horn sensitization in incisional pain. Pain. 2005 Apr;114(3):499-510. PubMed PMID: 15777875.

16: Koh S, Tibayan FD, Simpson JN, Jensen FE. NBQX or topiramate treatment after perinatal hypoxia-induced seizures prevents later increases in seizure-induced neuronal injury. Epilepsia. 2004 Jun;45(6):569-75. PubMed PMID: 15144420.

17: Van Damme P, Leyssen M, Callewaert G, Robberecht W, Van Den Bosch L. The AMPA receptor antagonist NBQX prolongs survival in a transgenic mouse model of amyotrophic lateral sclerosis. Neurosci Lett. 2003 Jun 5;343(2):81-4. PubMed PMID: 12759169.

18: Goda M, Isono M, Fujiki M, Kobayashi H. Both MK801 and NBQX reduce the neuronal damage after impact-acceleration brain injury. J Neurotrauma. 2002 Nov;19(11):1445-56. PubMed PMID: 12490009.

19: Mu X, Azbill RD, Springer JE. NBQX treatment improves mitochondrial function and reduces oxidative events after spinal cord injury. J Neurotrauma. 2002 Aug;19(8):917-27. PubMed PMID: 12225652.

20: Pitsikas N, Rigamonti AE, Cella SG, Muller EE. The non-NMDA receptor antagonist NBQX does not affect rats performance in the object recognition task. Pharmacol Res. 2002 Jan;45(1):43-6. PubMed PMID: 11820860.