Piperazine-1,4-bis(2-hydroxypropanesulfonic acid) dihydrate

IUPAC Name: 2-hydroxy-3-[4-(2-hydroxy-3-sulfopropyl)piperazin-1-yl]propane-1-sulfonic acid 
Empirical Formula: C₁₀H₂₂N₂O₈S₂
Molecular Weight: 362.4203g/mol
EINECS: 269-199-1 
Structure of 1,4-Piperazinedipropanesulfonicacid, b1,b4-dihydroxy- (CAS NO.68189-43-5):

Index of Refraction: 1.593
Molar Refractivity: 77.8 cm³
Molar Volume: 229.5 cm³
Polarizability: 30.84×10^-24cm³
Surface Tension: 75.6 dyne/cm
Density: 1.578 g/cm³ 
Product Categories: Biochemistry;Good's Buffers;Buffer 
Canonical SMILES: C1CN(CCN1CC(CS(=O)(=O)O)O)CC(CS(=O)(=O)O)O
InChI: InChI=1S/C10H22N2O8S2/c13-9(7-21(15,16)17)5-11-1-2-12(4-3-11)6-10(14)8-22(18,19)20/h9-10,13-14H,1-8H2,(H,15,16,17)(H,18,19,20)
InChIKey: LVQFQZZGTZFUNF-UHFFFAOYSA-N

Hazard Codes: T
Risk Statements: 21-23/24/25-25-36/37/38
R21:Harmful in contact with skin. 
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 22-24/25-45-36/37/39-26 
S22:Do not breathe dust. 
S24/25:Avoid contact with skin and eyes. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
WGK Germany: 3

  1,4-Piperazinedipropanesulfonicacid, b1,b4-dihydroxy- , its cas register number is 68189-43-5. It also can be called EINECS 269-199-1 ; Piperazine-N,N'-bis(2-hydroxypropanesulfonic acid) ; beta,beta'-Dihydroxypiperazine-1,4-dipropanesulphonic acid . 1,4-Piperazinedipropanesulfonicacid, b1,b4-dihydroxy- (CAS NO.68189-43-5) is harmful in contact with skin and toxic by inhalation, in contact with skin and if swallowed.