OTR-AC (Ostarine Acetate)
- Chemical Name: ((S)-3-(4-cyanophenoxy)-N-(4-cyano-3-(trifluoromethyl)phenyl)-2-hydroxy-2-methylpropanamide) acetic acid ester
- Other Name(s): OTR-AC; Ostarine O-Acetate; (related parent compound) Ostarine / Enobosarm / MK-2866 / GTx-024 (parent SARM)
- CAS: 1025658-44-9
- Powder Purity: >99% HPLC
- Solubility: Propylene Glycol, DMSO, Ethanol
- Molar Mass: 431.37–431.38 g/mol
- Chemical Formula: C₂₁H₁₆F₃N₃O₄
- Melting Point: 134 to 138°C
- Appearance: White crystalline powder, odorless, bitter, slightly acidic tang
- Physical Form: Solid, powder
- Biological Half-Life: 36-48 hours
- Research: 10-30mgs every 2 to 3 days
Ostarine acetate is an acetylated ester form of Ostarine (Enobosarm/MK-2866), a selective androgen receptor modulator (SARM). The acetate modification is intended to alter molecular stability and potentially change how the compound is absorbed or processed, though most pharmacological data come from the parent compound, not the acetate ester itself, and published clinical data for the acetate form is limited.
Ostarine and related derivatives have been researched for potential applications in muscle wasting, osteoporosis, cancer-related cachexia, and age-related muscle decline, due to their ability to selectively bind androgen receptors in muscle and bone while aiming to reduce androgenic effects in other tissues. However, no form of Ostarine is FDA-approved, and OTR-AC is typically sold only as a laboratory research chemical, not a therapeutic product.
In raw material form, OTR-AC appears as a white crystalline powder with high-purity chemical specifications and solubility in solvents like DMSO, ethanol, and propylene glycol.








