Cetrimonium, cetyl trimethylammonium, or hexadecyltrimethylammonium is a quaternary ammonium cation whose salts are used as antiseptics:
They have the ATC codes D08AJ02 (WHO) (as skin antiseptics) and R02AA17 (WHO) (as throat antiseptics).
References
Cetrimonium Wikipedia(Text) CC BY-SA