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The Collaborative International Dictionary
Isatogen

Isatogen \I*sat"o*gen\, n. [Isatin + -gen.] (Chem.) A complex nitrogenous radical, C8H4NO2, regarded as the essential residue of a series of compounds, related to isatin, which easily pass by reduction to indigo blue. -- I*sat`o*gen"ic, a.

Wiktionary
isatogen

n. (context organic compound English) A complex nitrogenous radical, C8H4NO2, related to isatin.