Answer: isatin

AnswerCrossword Clue
ISATINCrystalline compound.
ISATINChemical compound.
ISATINOrange-red dye stuff.
ISATINDye substance
ISATINCompound used in making dyes
isatinyellowish-red or orange, crystalline, water-soluble solid, C8H5NO2, used chiefly in the synthesis of vat dyes
isatina chemical compound, also ISATINE