... > SECTION VI - PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES > CHAPTER 29 - ORGANIC CHEMICALS > XI. PROVITAMINS, VITAMINS AND HORMONES > 2936 Provitamins and vitamins, natural or reproduced by synthesis (including natural concentrates), derivatives thereof used primarily as vitamins, and intermixtures of the foregoing, whether or not in any solvent > Vitamins and their derivatives, unmixed > Vitamin B2 and its derivatives