Explanatory notes
… residuary valence may , however, be filled by other anions (chloride, bromide, iodide, etc.) to give quaternary ammonium … all fresh seeds. A compound from which other very important biological substances are derived (e.g., acetylcholine, … , a quaternary intramolecular salt, and betaine hydrochloride , used, e.g., in medicine, cosmetics and animal …