CAS Number: 1202044-20-9 Other Names: MK2866, MK 2866, Ostarine, Enobosarm, Enobosarm-d4 Molecular Formula: C₁₉H₁₄F₃N₃O₃ Molecular Weight: 389.3 Purity: ≥99% What Is MK-2866 (Ostarine) Enobosarm ? Ostarine, also known as MK-2866, MK-0773, GTx-024, and Enobosarm, is an oral nonsteroidal selective androgen receptor modulator (SARM). Formerly under the development of the pharmaceutical company Gtx and Merck, for the treatment of muscle wasting …