As a general rule, chemicals covered by Chapters 28 and 29 are restricted to separate chemically defined compounds which are substances that consist of one molecular species whose composition is defined by a constant ratio of elements and can be represented by a definitive structural diagram. These, and chemicals as covered by Chapter 38 of the UK Trade Tariff (the Tariff), may come under both export and import controls as this topic describes.

This topic also covers the specific regional areas of China, Japan and Switzerland with respect to importing pharmaceutical products into these countries.

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