Benzododecinium bromide (systematic name dimethyldodecylbenzylammonium bromide) is a quaternary ammonium compound used as antiseptic and disinfectant (phenol coefficient is 20-30^[1]). It is highly soluble in water and has properties of cationic surfactant.

Benzododecinium bromide

Names
Preferred IUPAC name N-Benzyl-N,N-dimethyldodecan-1-aminium bromide
Identifiers
CAS Number	7281-04-1 N
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL2355417 N
ChemSpider	22165 Y
ECHA InfoCard	100.027.908
EC Number	230-698-4
PubChem CID	23705
UNII	IRY12B2TQ6 N
CompTox Dashboard (EPA)	DTXSID4048698
InChI InChI=1S/C21H38N.BrH/c1-4-5-6-7-8-9-10-11-12-16-19-22(2,3)20-21-17-14-13-15-18-21;/h13-15,17-18H,4-12,16,19-20H2,1-3H3;1H/q+1;/p-1 Y Key: KHSLHYAUZSPBIU-UHFFFAOYSA-M Y InChI=1/C21H38N.BrH/c1-4-5-6-7-8-9-10-11-12-16-19-22(2,3)20-21-17-14-13-15-18-21;/h13-15,17-18H,4-12,16,19-20H2,1-3H3;1H/q+1;/p-1 Key: KHSLHYAUZSPBIU-REWHXWOFAH
SMILES [Br-].c1ccccc1C[N+](C)(CCCCCCCCCCCC)C
Properties
Chemical formula	C21H38N+ · Br−
Molar mass	384.437 g·mol−1
Pharmacology
ATC code	D09AA05 (WHO)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Benzododecinium bromide is effective against gram-positive microbes. In lower concentrations, its activity against conditionally gram-negative microorganisms (such as Proteus, Pseudomonas, Clostridium tetani etc.) is uncertain. It is not effective against Mycobacterium tuberculosis and bacterial spores. Longer expositions may inactivate some viruses.^[1]

Benzododecinium bromide is an active ingredient in the trademarked antiseptic product Ajatin produced in the Czech Republic. In place of bromide, the benzododecinium cation may be used with chloride or another anion.