Thymosin a1 acetate, also known as thymalfasin has immunoregulatory properties enhancing immune functions. Thymosin a1 has molecular formula of C129H215N33O55 a.a. sequence of Ac-Ser-Asp-Ala-Ala- Val-Asp-Thr-Ser-Ser-Glu-Ile- Thr-Thr-Lys-Asp 1 * 5 mg