IUPAC Name: 1H-Pyrazol-5-amine 
Following is the structure of 3-Aminopyrazole (CAS NO.1820-80-0):
                   
Empirical Formula: C₃H₅N₃
Molecular Weight: 83.09
EINECS: 217-338-1
Mol File: 1820-80-0.mol 
Melting point: 33-39 °C
Storage temp:  2-8 °C
BRN:  1618 
Index of Refraction: 1.647
Molar Refractivity: 23.01 cm³
Molar Volume: 63.2 cm³
Density: 1.313 g/cm³
Flash Point: 182.6 °C
Sensitive:  Air & Light Sensitive
Surface Tension: 76.1 dyne/cm
Enthalpy of Vaporization: 57.75 kJ/mol
Boiling Point: 334.5 °C at 760 mmHg
Vapour Pressure: 0.000127 mmHg at 25 °C
CAS DataBase Reference: 1820-80-0(CAS DataBase Reference)
NIST Chemistry Reference: 1820-80-0(NIST)
Appearance of 3-Aminopyrazole (CAS NO.1820-80-0): Low-Melting Yellow Solid
Product Categories of 3-Aminopyrazole (CAS NO.1820-80-0): Imidazoles, Pyrroles, Pyrazoles, Pyrrolidines; Amines; Pyrazoles & Triazoles; Heterocyclic Compounds; Bases & Related Reagents; Heterocycles; Nucleotides; Pyrazoles & Triazoles
Canonical SMILES: C1=C(NN=C1)N
InChI: InChI=1S/C3H5N3/c4-3-1-2-5-6-3/h1-2H,(H3,4,5,6)
InChIKey: JVVRJMXHNUAPHW-UHFFFAOYSA-N

 3-Aminopyrazole (CAS NO.1820-80-0) can be used in the preparation of heterocyclic compounds of pharamaceutical interest.

 3-Aminopyrazole (CAS NO.1820-80-0) hasn't been listed as a carcinogen by ACGIH, IARC, NTP, or CA Prop 65. And the toxicological properties have not been fully investigated.

Hazard Codes: C,Xi
Risk Statements: 22-34-36/37/38 
R22:Harmful if swallowed. 
R34:Causes burns. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements:  26-36/37/39-45-27 
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.) 
S27:Take off immediately all contaminated clothing.
RIDADR: UN 3263 8/PG 2
WGK Germany: 3
F: 8-10-23
Hazard Note: Corrosive

 3-Aminopyrazole , its cas register number is 1820-80-0. It also can be called 3-Pyrazolamine; 1H-Pyrazol-3-amine .
 3-Aminopyrazole (CAS NO.1820-80-0) is stable It should avoid the condition like incompatible materials. It is not compatible with incompatible materials, acids, acid chlorides, acid anhydrides. And also prevent it to broken down into hazardous decomposition products: nitrogen oxides, carbon monoxide, carbon dioxide. However, its hazardous polymerization will not occur.