| 1. | Various soft corals also contain guaiazulene as a principal pigment.
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| 2. | The electronic structure ( and colors ) of guaiazulene and azulene are very similar.
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| 3. | A derivative of azulene, guaiazulene is a bicyclic chamomile oil, which also serve as its commercial sources.
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| 4. | Its low melting point makes guaiazulene difficult to handle, in contrast to the crystalline nature of the parent azulene.
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| 5. | The blue color of the mushroom " Lactarius indigo " is due to the guaiazulene derivative ( 7-isopropenyl-4-methylazulen-1-yl ) methyl stearate.
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