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DMI ref. omg007     Image title: Isatin | 7.58 Copyright 2006 David Malin Images Isatin (Indole-2,3-dione, 2:3-Indolinedione, CAS# 91-56-5) forms yellow-red crystalline needles and melts to a yellow liquid at about 200C. It is an important raw material for dye manufacture (artificial indigo, disperse dye yellows) and is used for the manufacture of pharmaceuticals. Magnification x20 on original slide.