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Butyric acid
Butyric acid (C3H7 CO2H) is a fatty acid found especially in rancid butter that has an unpleasant odor and acrid taste, with a sweetish aftertaste (similar to ether).
There are two metameric butyric acids, called in distinction the normal- and iso-butyric acid. The normal butyric acid is the one common in rancid butter.
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