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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Benzofurazans are important pharmaceutical intermediates. Benzofurazans are known bioisosteres of the nitro group. Both oxadiazoles and nitro groups have strong electron-withdrawing properties, but when optimizing drug-like properties such as activity, selectivity, and stability, the absence of standard charges in the oxadiazole structure may be more beneficial to drug products. What's more, nitro groups have been identified as toxic groups, and it is routine to remove or replace them in the early stages of drug development.
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