Following is the structure of 1-Butylpyridinium bromide (CAS NO.874-80-6):
                          
Empirical Formula: C₉H₁₄BrN
Molecular Weight: 216.1182 g/mol
Sensitive: Hygroscopic
Melting point of 1-Butylpyridinium bromide (CAS NO.874-80-6): 104-107 °C
Appearance of 1-Butylpyridinium bromide (CAS NO.874-80-6): White to beige crystalline powder or crystals
Product Categories of 1-Butylpyridinium bromide (CAS NO.874-80-6): Ionic Liquids; Pyridinium Compounds; Pyridinium Compounds (Ionic Liquids); Synthetic Organic Chemistry; Chemical Synthesis; Ionic Liquids; Pyridinium
SMILES: [Br-].[n+]1(ccccc1)CCCC
InChI: InChI=1/C9H14N.BrH/c1-2-3-7-10-8-5-4-6-9-10;/h4-6,8-9H,2-3,7H2,1H3;1H/q+1;/p-1
InChIKey: KVBQNFMTEUEOCD-REWHXWOFAD

 1-Butylpyridinium bromide (CAS NO.874-80-6) 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: Xn,Xi
Risk Statements: 22-36/37/38 
R22:Harmful if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 37/39-26 
S37/39:Wear suitable 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
F: 3-21

 1-Butylpyridinium bromide , its cas register number is 874-80-6. It also can be called Pyridinium, 1-butyl-, bromide (1:1) .
 1-Butylpyridinium bromide (CAS NO.874-80-6) could be stable under normal temperatures and pressures. It will absorbs moisture or water from the air. So, it should avoid the condition like exposure to moist air or water. And also prevent it to broken down into hazardous decomposition products: nitrogen oxides, carbon monoxide, carbon dioxide, hydrogen bromide. However, its hazardous polymerization has not been reported.