Indole is a compound of pyrrole and benzene in parallel, also known as benzopyrrole. There are two combinations of pyrrole and benzene, called indole and isoindole, respectively. Many derivatives of indole have physiological and pharmacological activities, and can synthesize vasodilators, antihistamines, antipyretic analgesics, etc. in medicine, so indole is also a very important heterocyclic compound.
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The quinones are a class of organic compounds that are formally derived from aromatic compounds by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double bonds, resulting in a fully conjugated cyclic dione structure. Quinones exhibit numerous biological activities such as neurological, antibacterial, antiplasmodial, antioxidantal, trypanocidal, antitumor, and anti-HIV, and these activities have been proven to be related to the redox properties of their carbonyl functions.
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