Molecular structure of 1-(3-Hydroxyphenyl)piperazine (CAS NO.59817-32-2) is:

Product Name: 1-(3-Hydroxyphenyl)piperazine
CAS Registry Number: 59817-32-2
Systematic Name: 3-Piperazin-1-ylphenol
Molecular Formula: C₁₀H₁₄N₂O
Molecular Weight: 178.23
Index of Refraction: 1.576 
Molar Refractivity: 51.68 cm³ 
Molar Volume: 156.1 cm³
Surface Tension: 44.8 dyne/cm 
Density: 1.141 g/cm³ 
Flash Point: 178.3 °C 
Enthalpy of Vaporization: 64.25 kJ/mol 
Boiling Point: 371.3 °C at 760 mmHg 
Vapour Pressure: 4.89E-06 mmHg at 25 °C 
Melting Point: 217-221 °C(lit.)
Sensitive: Air Sensitive
Product Categories: PIPERIDINE;Pyrazines;API intermediates;piperazines
SMILES: Oc1cc(ccc1)N2CCNCC2
InChI: InChI=1/C10H14N2O/c13-10-3-1-2-9(8-10)12-6-4-11-5-7-12/h1-3,8,11,13H,4-7H2
InChIKey: AYGYICRITMSJOC-UHFFFAOYAO 
Std. InChI: InChI=1S/C10H14N2O/c13-10-3-1-2-9(8-10)12-6-4-11-5-7-12/h1-3,8,11,13H,4-7H2
Std. InChIKey: AYGYICRITMSJOC-UHFFFAOYSA-N 

Safty information about 1-(3-Hydroxyphenyl)piperazine (CAS NO.59817-32-2) is:
Hazard Codes: Xn; C
Risk Statements: 22-37/38-41 
R22:Harmful if swallowed. 
R37/38:Irritating to respiratory system and skin. 
R41:Risk of serious damage to the eyes.
Safety Statements: 26-36/37/39 
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.
RIDADR: UN 2811 6.1/PG 3
WGK Germany: 3
Hazard Note: Irritant
HazardClass: 8
PackingGroup: III

 1-(3-Hydroxyphenyl)piperazine , its cas register number is 59817-32-2. It also can be called 3-(1-Piperazino)phenol ; Phenol,3-(1-piperazinyl)- .