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This heading covers separate chemically defined organic compounds not classified elsewhere.

(1) Ketenes. Like ketones, these are characterised by a carbonyl group (C=O) but it is linked to the neighbouring carbon atom by a double bond (e.g., ketene, diphenylketene).
This heading however excludes diketene which is a lactone of heading 29.32.

(2) Boron trifluoride complexes with acetic acid, diethyl ether or phenol.

(3) Dithymol di-iodide.

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