Oksibutirat natriyning kimyoviy formulasi C4H7NaO3. Gamma-hidroksibutiratning natriy tuzi sifatida molekulyar tarkibi: C 4, H 7, Na 1, O 3. Atom massasiga asoslangan hisob: C (12.011×4=48.044), H (1.008×7=7.056), Na (22.98977×1=22.98977), O (15.999×3=47.997). Molyar massa jami 126.08677 g·mol−1, taxminiy qiymat 126.09 g·mol−1