… 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. …
Explanatory notes
… In this Sub-Chapter, the term “derivatives” refers to chemical compounds which could be obtained from a starting compound of the heading concerned and which retain the essential characteristics of the parent compound, … structure. 29.36 - Provitamins and vitamins, natural or reproduced by synthesis (including natural concentrates), …