The Collaborative International Dictionary
isatine
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, isatine.]
Wiktionary
isatine
n. (alternative form of isatin English)