| Blue liquid is a quaternary ammonium compound. | ของเหลวสีฟ้านี่ประกอบไปด้วยแอมโมเนียมสี่ส่วน And How Does That Make You Kill? (2008) |
| quaternary ammonium compound | (n) a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface-active agents, disinfectants, and in drugs |