Following is the structure of D-Cysteine,hydrochloride, hydrate (1:1:1) (CAS NO.207121-46-8):
                       
Empirical Formula: C₃H₁₀ClNO₃S
Molecular Weight: 175.6344 
EINECS: 251-043-9
Flash Point: 131.5 °C
Storage temp.: 2-8 °C
Melting point: ~185 °C (dec.)
Enthalpy of Vaporization: 58.69 kJ/mol
Boiling Point: 293.9 °C at 760 mmHg
Vapour Pressure: 0.000411 mmHg at 25 °C 
Product Categories of D-Cysteine,hydrochloride, hydrate (1:1:1) (CAS NO.207121-46-8): alpha-Amino Acids; Amino Acids; Biochemistry
SMILES: Cl.O=C(O)[C@H](N)CS.O
InChI: InChI=1/C3H7NO2S.ClH.H2O/c4-2(1-7)3(5)6;;/h2,7H,1,4H2,(H,5,6);1H;1H2/t2-;;/m1../s1
InChIKey: QIJRTFXNRTXDIP-YBBRRFGFBR

Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
WGK Germany: 3
F: 3-10-23

 D-Cysteine,hydrochloride, hydrate (1:1:1) , its cas register number 207121-46-8. It also can be called D-Cysteine hydrochloride monohydrate .