Melting point :57-60 °C (dec.) (lit.)
Boiling point :163 °C/23 mmHg (lit.)
alpha :21 º (c=10, H2O)
Density :1.238 g/mL at 25 °C (lit.)
refractive index :21 ° (C=2.5, H2O)
Flash point :>230 °F
storage temp. :Inert atmosphere,Room Temperature
pka :11.44±0.20(Predicted)
form :Crystals
color :White
Specific Gravity :1.3046 (50/4℃)
optical activity :[α]22/D +21°, c = 2.5 in H2O
Water Solubility :Soluble in water.
BRN :1726256
LogP :-1.350 (est)
CAS DataBase Reference :608-68-4(CAS DataBase Reference)
NIST Chemistry Reference :Butanedioic acid, 2,3-dihydroxy- [R-(R*,R*)]-, dimethyl ester(608-68-4)
EPA Substance Registry System :Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, dimethyl ester (608-68-4)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P321 Specific treatment (see … on this label). P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P362 Take off contaminated clothing and wash before reuse.