Definition of "isatin" [i•sa•tin]

• The indole derivative 1H-indole-2,3-dione, used in the synthesis of dyes. (noun)

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• "Isatis I. indigotica or I. tinctoria, also known as da qing ye in Traditional Chinese Medicine, contains indican and isatin B among other compounds and is known to have potent antibacterial properties against staphylococci, pneumococci, and meningococci, which means that it is useful for virtually all common bacterial infections."