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From The Collaborative International Dictionary of English v.0.48:
Isatin \I"sa*tin\, n. [See Isatis.] (Chem.)
An orange-red crystalline substance, C8H5NO2, obtained by
the oxidation of indigo blue. It is also produced from
certain derivatives of benzoic acid, and is one important
source of artificial indigo. [Written also, less properly,