Trimethyl ammonium compounds

Trimethyl ammonium compounds are a type of quaternary ammonium compound with three methyl groups at the nitrogen, with a more complicated carbon chain derivative at the fourth position.

Examples include:
 * Betaine
 * Bethanechol
 * Carnitine and its derivatives
 * Choline and its derivatives
 * Methacholine
 * Muscarine
 * Trimethylglycine
 * Benzyltrimethylammonium