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CN2923
29 Organic Chemicals
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
29239000 (01/1988-..) Quaternary Ammonium Salts and Hydroxides (Excl. Choline and its Salts)