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What is limonene ?
Limonene is found in the essential oils of citrus fruits and many other plant species and is the main aroma component in oranges.
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The limonene molecule (C10H16) exists in two forms that are mirror images of each other:
l-limonene, which has a piney, turpentine smell, and
d-limonene, which has a pleasing orange scent
The different scents are the mind's interpretation of the shape of the molecules.