1. A red or orange crystalline organic compound derived from indigo, used in organic synthesis and as a dye intermediate.
Usage: chemistry; technical

Examples

• Isatin is commonly used in the synthesis of pharmaceuticals and agrochemicals.
• The chemist isolated isatin from the indigo plant extract.
• Isatin derivatives have been studied for their potential biological activity.
• The red crystals of isatin were purified through recrystallization.
• Researchers used isatin as a starting material for the new drug compound.