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

MedKoo CAT#: 555866

CAS#: 246020-68-8

Description: HUN20688, also known as TXNRD1 inhibitor 1 ands TRi-1, is a potent, specific and irreversible inhibitor of cytosolic thioredoxin reductase 1 (TXNRD1). This product has not formal name. For the convenience of scientific communication, we named it by combining its Inchi key (3 letters from the first letter of each section) with the last 5 digits of its CAS number or its molecule weight if its CAS number is not available (see MedKoo Chemical Nomenclature,

Chemical Structure

CAS# 246020-68-8

Theoretical Analysis

MedKoo Cat#: 555866
Name: HUN20688
CAS#: 246020-68-8
Chemical Formula: C13H10ClNO5S
Exact Mass: 326.9968
Molecular Weight: 327.735
Elemental Analysis: C, 47.64; H, 3.08; Cl, 10.82; N, 4.27; O, 24.41; S, 9.78

Price and Availability

Size Price Availability Quantity
100.0mg USD 750.0 2 Weeks
200.0mg USD 1150.0 2 Weeks
500.0mg USD 1850.0 2 Weeks
1.0g USD 2450.0 2 Weeks
2.0g USD 3950.0 2 Weeks
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Synonym: TXNRD1 inhibitor 1; TRi-1; HUN20688; HUN-20688; HUN 20688;

IUPAC/Chemical Name: 2-((4-chlorophenyl)sulfonyl)-4-methoxy-1-nitrobenzene


InChi Code: InChI=1S/C13H10ClNO5S/c1-20-10-4-7-12(15(16)17)13(8-10)21(18,19)11-5-2-9(14)3-6-11/h2-8H,1H3

SMILES Code: O=[N+](C1=CC=C(OC)N=C1S(=O)(C2=CC=C(Cl)C=C2)=O)[O-]

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: >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: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 327.735 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

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[1]. Stafford WC, et al. Irreversible inhibition of cytosolic thioredoxin reductase 1 as a mechanistic basis for anticancer therapy. Sci Transl Med. 2018 Feb 14;10(428). pii: eaaf7444.


10.0mg / Not available

Additional Information

Cancer cells adapt to their inherently increased oxidative stress through activation of the glutathione (GSH) and thioredoxin (TXN) systems. Inhibition of both of these systems effectively kills cancer cells, but such broad inhibition of antioxidant activity also kills normal cells, which is highly unwanted in a clinical setting.

TXNRD1 inhibitor 1 (TRi-1) impaired growth and viability of human tumor xenografts and syngeneic mouse tumors while having little mitochondrial toxicity and being better tolerated than auranofin. These results display the therapeutic anticancer potential of irreversibly targeting cytosolic TXNRD1 using small molecules and present potent and selective TXNRD1 inhibitors. Given the pronounced up-regulation of TXNRD1 in several metastatic malignancies, it seems worthwhile to further explore the potential benefit of specific irreversible TXNRD1 inhibitors for anticancer therapy.