CLP257
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    WARNING: This product is for research use only, not for human or veterinary use.

Hodoodo CAT#: H527683

CAS#: 1181081-71-9

Description: CLP257 is a putative KCC2 upregulator. CLP257 improved chloride homeostasis and reduced the duration and frequency of ILDs in a concentration-dependent manner. CLP257 exhibits selectivity for KCC2 over other KCC family members. CLP257 enhances Cl- transport and increases KCC2 plasma membrane expression in spinal slices with reduced KCC2 function.


Chemical Structure

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CLP257
CAS# 1181081-71-9

Theoretical Analysis

Hodoodo Cat#: H527683
Name: CLP257
CAS#: 1181081-71-9
Chemical Formula: C14H14FN3O2S
Exact Mass: 307.08
Molecular Weight: 307.343
Elemental Analysis: C, 54.71; H, 4.59; F, 6.18; N, 13.67; O, 10.41; S, 10.43

Price and Availability

Size Price Availability Quantity
25mg USD 250 2 Weeks
50mg USD 450 2 Weeks
100mg USD 750 2 Weeks
200mg USD 1250 2 Weeks
500mg USD 2650 2 Weeks
1g USD 3750 2 Weeks
2g USD 6250 2 Weeks
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Synonym: CLP 257; CLP-257; CLP257

IUPAC/Chemical Name: (5Z)-5-[(4-Fluoro-2-hydroxyphenyl)methylene]-2-(tetrahydro-1-(2H)-pyridazinyl)-4(5H)-thiazolone

InChi Key: SKCADXVKQRCWTR-GHXNOFRVSA-N

InChi Code: InChI=1S/C14H14FN3O2S/c15-10-4-3-9(11(19)8-10)7-12-13(20)17-14(21-12)18-6-2-1-5-16-18/h3-4,7-8,16,19H,1-2,5-6H2/b12-7-

SMILES Code: O=C1N=C(N2CCCCN2)S/C1=C\C3=CC=C(F)C=C3O

Appearance: Solid powder

Purity: >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).

Solubility: 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: 2934.99.9001

More Info:

Biological target:
In vitro activity:
In vivo activity:

Preparing Stock Solutions

The following data is based on the product molecular weight 307.34 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.

Recalculate based on batch purity %
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
Formulation protocol:
In vitro protocol:
In vivo protocol:

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1: Gao Y, Zhan W, Jin Y, Chen X, Cai J, Zhou X, Huang X, Zhao Q, Wang W, Sun J. KCC2 receptor upregulation potentiates antinociceptive effect of GABAAR agonist on remifentanil-induced hyperalgesia. Mol Pain. 2022 Jan- Dec;18:17448069221082880. doi: 10.1177/17448069221082880. PMID: 35352582; PMCID: PMC8972932.


2: Paige C, Plasencia-Fernandez I, Kume M, Papalampropoulou-Tsiridou M, Lorenzo LE, David ET, He L, Mejia GL, Driskill C, Ferrini F, Feldhaus AL, Garcia- Martinez LF, Akopian AN, De Koninck Y, Dussor G, Price TJ. A Female-Specific Role for Calcitonin Gene-Related Peptide (CGRP) in Rodent Pain Models. J Neurosci. 2022 Mar 9;42(10):1930-1944. doi: 10.1523/JNEUROSCI.1137-21.2022. Epub 2022 Jan 20. PMID: 35058371; PMCID: PMC8916765.


3: Bilchak JN, Yeakle K, Caron G, Malloy D, Côté MP. Enhancing KCC2 activity decreases hyperreflexia and spasticity after chronic spinal cord injury. Exp Neurol. 2021 Apr;338:113605. doi: 10.1016/j.expneurol.2021.113605. Epub 2021 Jan 13. PMID: 33453210; PMCID: PMC7904648.


4: Dzhala VI, Staley KJ. KCC2 Chloride Transport Contributes to the Termination of Ictal Epileptiform Activity. eNeuro. 2021 Mar 9;8(2):ENEURO.0208-20.2020. doi: 10.1523/ENEURO.0208-20.2020. PMID: 33239270; PMCID: PMC7986536.


5: Jin X, Kim WB, Kim MN, Jung WW, Kang HK, Hong EH, Kim YS, Shim WJ, Han HC, Colwell CS, Kim YB, Kim YI. Oestrogen inhibits salt-dependent hypertension by suppressing GABAergic excitation in magnocellular AVP neurons. Cardiovasc Res. 2021 Aug 29;117(10):2263-2274. doi: 10.1093/cvr/cvaa271. PMID: 32960965.


6: Lizhnyak PN, Muldoon PP, Pilaka PP, Povlishock JT, Ottens AK. Traumatic Brain Injury Temporal Proteome Guides KCC2-Targeted Therapy. J Neurotrauma. 2019 Nov 15;36(22):3092-3102. doi: 10.1089/neu.2019.6415. Epub 2019 Jul 31. PMID: 31122143; PMCID: PMC6818491.


7: Gagnon M, Bergeron MJ, Perez-Sanchez J, Plasencia-Fernández I, Lorenzo LE, Godin AG, Castonguay A, Bonin RP, De Koninck Y. Reply to The small molecule CLP257 does not modify activity of the K+-Cl- co- transporter KCC2 but does potentiate GABAA receptor activity. Nat Med. 2017 Dec 7;23(12):1396-1398. doi: 10.1038/nm.4449. PMID: 29216044.


8: Cardarelli RA, Jones K, Pisella LI, Wobst HJ, McWilliams LJ, Sharpe PM, Burnham MP, Baker DJ, Chudotvorova I, Guyot J, Silayeva L, Morrow DH, Dekker N, Zicha S, Davies PA, Holenz J, Duggan ME, Dunlop J, Mather RJ, Wang Q, Medina I, Brandon NJ, Deeb TZ, Moss SJ. The small molecule CLP257 does not modify activity of the K+-Cl- co-transporter KCC2 but does potentiate GABAA receptor activity. Nat Med. 2017 Dec 7;23(12):1394-1396. doi: 10.1038/nm.4442. PMID: 29216042; PMCID: PMC7371006.


9: Ferrini F, Lorenzo LE, Godin AG, Quang ML, De Koninck Y. Enhancing KCC2 function counteracts morphine-induced hyperalgesia. Sci Rep. 2017 Jun 20;7(1):3870. doi: 10.1038/s41598-017-04209-3. PMID: 28634406; PMCID: PMC5478677.


10: Hamidi S, Avoli M. KCC2 function modulates in vitro ictogenesis. Neurobiol Dis. 2015 Jul;79:51-8. doi: 10.1016/j.nbd.2015.04.006. Epub 2015 Apr 26. PMID: 25926348; PMCID: PMC4880462.


11: Bergeron MJ, Castonguay A, De Koninck Y. KCC2 : nouvelle cible thérapeutique pour le traitement de pathologies neurologiques [KCC2: a new therapeutical target for the treatment of neurological diseases]. Med Sci (Paris). 2014 May;30(5):514-7. French. doi: 10.1051/medsci/20143005013. Epub 2014 Jun 13. PMID: 24939537.


12: Gagnon M, Bergeron MJ, Lavertu G, Castonguay A, Tripathy S, Bonin RP, Perez- Sanchez J, Boudreau D, Wang B, Dumas L, Valade I, Bachand K, Jacob-Wagner M, Tardif C, Kianicka I, Isenring P, Attardo G, Coull JA, De Koninck Y. Chloride extrusion enhancers as novel therapeutics for neurological diseases. Nat Med. 2013 Nov;19(11):1524-8. doi: 10.1038/nm.3356. Epub 2013 Oct 6. PMID: 24097188; PMCID: PMC4005788.