This sub-Chapter covers active substances which constitute a group of compounds of fairly complex chemical composition, essential for the proper functioning and harmonious development of the animal and vegetable organism. They have mainly a physiological action and are used in medicine or industry because of their individual characteristics. 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, including its basic chemical structure.
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