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The stereochemistry of a number of functionally‐substituted 2‐oxoindolin‐3‐ylidene derivatives has been established by a study of pmr and ir spectroscopy. These compounds have been shown to exist as one isomer with the exception of the substituted acetonitriles.

* The stone industry uses the U.S. units of measurement and therefore these units are used in this report. SI length conversion factors are: 1 inch = 0.0254 meter (m) and 1 foot = 0.3048 meter (m) .

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