Molecular structure of D-Chlorosuccinic acid (CAS NO.3972-40-5) is:

Product Name: D-Chlorosuccinic acid
CAS Registry Number: 3972-40-5
Molecular Formula: C₄H₅ClO₄
Molecular Weight: 152.53
Melting Point: 150-153 °C
Index of Refraction: 1.508
Molar Refractivity: 28.51 cm³
Molar Volume: 95.5 cm³
Surface Tension: 64.3 dyne/cm
Density: 1.595 g/cm³
Flash Point: 96.4 °C
Enthalpy of Vaporization: 52.06 kJ/mol
Boiling Point: 235.8 °C at 760 mmHg
Vapour Pressure: 0.0168 mmHg at 25 °C
Storage temp.: 2-8 °C
Product Categories: chiral

Safty information about D-Chlorosuccinic acid (CAS NO.3972-40-5) is:
Hazard Codes: C
Risk Statements: 34 
R34:Causes burns.
Safety Statements: 26-36/37/39-45 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 3261
WGK Germany: 3
HazardClass: 8
PackingGroup: III

 D-Chlorosuccinic acid , its cas register number is 3972-40-5. It also can be called (R)-Chlorosuccinic acid ; (R)-2-Chlorobutanedioic acid ; (R)-2-Chlorobutanedioic acid .