Systematic Name: (2S)-2-Hydroxybutanoic acid
Synonyms of (S)-2-Hydroxybutyric acid (CAS NO.3347-90-8): (2S)-2-Hydroxybutanoic acid
CAS NO: 3347-90-8
Molecular Formula: C₄H₈O₃
Molecular Weight: 104.1
Molecular Structure:
H bond acceptors: 3
H bond donors: 2
Freely Rotating Bonds: 3
Polar Surface Area: 35.53 Å²
Index of Refraction: 1.455
Molar Refractivity: 23.63 cm³
Molar Volume: 87 cm³
Surface Tension: 46.3 dyne/cm
Density: 1.195 g/cm³
Flash Point: 112.2 °C
Enthalpy of Vaporization: 55.22 kJ/mol
Boiling Point: 238.3 °C at 760 mmHg
Vapour Pressure: 0.00759 mmHg at 25°C
Melting Point 50-54 °C
Storage temp:Keep (S)-2-Hydroxybutyric acid (CAS NO.3347-90-8) at 2-8°C.
SMILES: O=C(O)[C@@H](O)CC Copy
InChI: InChI=1/C4H8O3/c1-2-3(5)4(6)7/h3,5H,2H2,1H3,(H,6,7)/t3-/m0/s1 Copy
InChIKey: AFENDNXGAFYKQO-VKHMYHEABR
Std. InChI: InChI=1S/C4H8O3/c1-2-3(5)4(6)7/h3,5H,2H2,1H3,(H,6,7)/t3-/m0/s1 Copy
Std. InChIKey: AFENDNXGAFYKQO-VKHMYHEASA-N

Hazard Codes: Xi
Risk Statements: 37/38-41
R37/38: (S)-2-Hydroxybutyric acid (CAS NO.3347-90-8) is irritating to respiratory system and skin. 
R41: Risk of serious damage to the eyes.
Safety Statements: 26-37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S37/39: Wear suitable gloves and eye/face protection.
WGK Germany: 2
F: 3-10