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(R)-(+)-Etomoxir Na | Carnitine palmitoyltransferase inhibitor

Etomoxir (828934-41-4) is an irreversible inhibitor of mitochondrial carnitine palmitoyl transferase 1 (CPT1).1 It is widely used to study fatty acid oxidation. Etomoxir has been investigated as a therapeutic agent for heart disease2, diabetes3, and cancer4,5. Use of etomoxir in concentrations greater than 5 µM induces acute production of ROS with associated evidence of severe oxidative stress in proliferating T cells indicating a loss of specificity for CTP1 at these concentrations.6 200 µM etomoxir inhibited complex I of the electron transport chain.7


1) Agius et al. (1991), Stereospecificity of the inhibition of etomoxir of fatty acid and cholesterol synthesis in isolated rat hepatocytes; Biochem. Pharmacol. 42 1717
2) Lionetti et al. (2011), Modulating fatty acid oxidation in heart failure; Cardiovasc. Res, 90 202
3) Huebinger et al. (1997), Effects of the carnitine-acyltransferase inhibitor etomoxir on insulin sensitivity, energy expenditure, and substrate oxidation in NIDDM; Horm. Metab. Res. 29 436
4) Pike et al. (2011), Inhibition of fatty acid oxidation by etomoxir impairs NADPH production and increases reactive oxygen species resulting in ATP depletion and cell death in human glioblastoma cells; Biochim. Biophys. Acta 1807 726
5) Samudio et al. (2010), Pharmacologic inhibition of fatty acid oxidation sensitizes human leukemia cells to apoptosis induction; J. Clin. Invest. 120 142
6) O’Connor et al. (2018), The CPT1a inhibitor, etomoxir, induces severe oxidative stress at commonly used concentrations; Sci. Rep. 8 6289
7) Yao et al. (2018), Identifying off-target effects of etomoxir reveals that carnitine palmitoyltransferase I is essential for cancer cell proliferation independent of β-oxidation; PLoS Biol. 16 e2003782

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Catalog#  10-4731-0005

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Catalog Number:
Carnitine palmitoyltransferase inhibitor
Chemical Name:
(R)-(+)-2-[6-(4-Chlorophenoxy)hexyl]-oxirane-2-carboxylic acid sodium salt
Molecular Weight:
Molecular Formula:
C15H18ClO4 • Na
Soluble in DMSO (up to 5 mg/ml with warming)
Physical Properties:
White solid
98% by HPLC
NMR (Conforms)
Storage Temperature:
Stable for 1 year as supplied. Solutions in DMSO may be stored at -20°C for up to 1 month.
Shipping Code:
Materials provided by Focus Biomolecules are for laboratory research use only and are not intended for human or veterinary applications.

Focus BiomoleculesPlymouth Meeting, PA USA1-855-FOCUS21

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