Heading
2923
Quaternary ammonium salts and hydroxides; lecithins and other phosphoaminolipids, whether or not chemically defined
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Subheadings
292310Quaternary ammonium salts and hydroxides; choline and its salts, whether or not chemically defined292320Lecithins and other phosphoaminolipids, whether or not chemically defined292330Quaternary ammonium salts and hydroxides; tetraethylammonium perfluorooctane sulphonate, whether or not chemically defined292340Quaternary ammonium salts and hydroxides; didecyldimethylammonium perfluorooctane sulphonate, whether or not chemically defined292390Quaternary ammonium salts and hydroxides; whether or not chemically defined n.e.c. in heading no. 2923