2923 Quaternary ammonium salts and hydroxides, lecithins and other phosphoaminolipids, whether or not chemically defined

2923 (01/1988-..) Quaternary ammonium salts and hydroxides, lecithins and other phosphoaminolipids, whether or not chemically defined 29231000 (01/1998-..) Choline and its salts 29231010 (01/1988-12/1997) Choline chloride 29231090 (01/1988-12/1997) Choline and its salts (excl. choline chloride) 29232000 (01/1988-..) Lecithins and other phosphoaminolipids, whether or not chemically defined 29233000 (01/2017-..) Tetraethylammonium perfluorooctane sulphonate 29234000 (01/2017-..) Didecyldimethylammonium perfluorooctane sulphonate 29239000 (01/2017-..) Quaternary ammonium salts and hydroxides (excl. choline and its salts, tetraethylammonium perfluorooctane sulphonate and didecyldimethylammonium perfluorooctane sulphonate)