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Nootkatone is a crystalline material possessing an extremely powerful grapefruit aroma and a woody topnote. It is found in citrus oils (for example, grapefruit) and can be purified from both citrus cold pressed oils as well as essential oils. Pure nootkatone products are white to yellowish crystals, whereas nootkatone products of lesser purity are transparent yellowish to yellow colored liquids.
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