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C4992 Sigma

Carboxyatractyloside potassium salt

≥98% (HPLC), from Xanthium sibiricum, solid

Synonym: C-ATR, CAT

  • CAS Number 77228-71-8 (free acid)

  • Empirical Formula (Hill Notation) C31H46O18S2 · xK+

  • Molecular Weight 770.82 (free acid basis)



Related Categories Apoptosis Inducers, Apoptosis and Cell Cycle, Bioactive Small Molecule Alphabetical Index, Bioactive Small Molecules, C-CH,
biological source   from Xanthium sibiricum
assay   ≥98% (HPLC)
form   solid
storage condition   desiccated
color   white
solubility   H2O: ≥10 mg/mL
storage temp.   −20°C


Biochem/physiol Actions

Carboxyatractyloside is a highly selective inhibitor of cytosolic side-specific mitochondrial ADP/ATP carrier; i.e. adenine nucleotide translocase (ANT); causes stabilization of the c conformation of ANT leading to permeability transition pore (PTP) opening, loss of mitochondrial membrane potential, and apoptosis.

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This compound is a featured product for Apoptosis research. Click here to discover more featured Apoptosis products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.

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Safety & Documentation

Safety Information

GHS06  GHS06
Signal word 
Hazard statements 
Precautionary statements 
UN 2811 6.1 / PGI
WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


Discover Bioactive Small Molecules for Apoptosis

Apoptosis, or programmed cell death (PCD), is a selective process for the removal of unnecessary, infected or transformed cells in various biological systems. As it plays a role in the homeostasis of...
Keywords: Apoptosis, Bioactive small molecules, Cancer, Clinical, Diseases, Ligands, Neurodegenerative Diseases

Discover Bioactive Small Molecules for Cell Cycle Research

In proliferating cells, the cell cycle consists of four phases. Gap 1 (G1) is the interval between mitosis and DNA replication that is characterized by cell growth. Replication of DNA occurs during t...
Keywords: Apoptosis, Bioactive small molecules, Cancer, Cell division, Cell proliferation, DNA replication, Diseases, Genetic

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