crotonic acid

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cro·ton·ic acid

 (krō-tŏn′ĭk)
n.
Either of two geometric isomers of a corrosive organic acid, C4H6O2, used in the preparation of pharmaceuticals and resins.

[From New Latin Croton, plant genus; see croton.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

crotonic acid

(krəʊˈtɒnɪk)
n
(Elements & Compounds) a colourless crystalline insoluble unsaturated carboxylic acid produced by oxidation of crotonaldehyde and used in organic synthesis; trans-2-butenoic acid. Formula: CH3CH:CHCOOH
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The bacterial oxidation of the DBT was evaluated through the appearance of the 3-hydroxy-2-formyl benzothiophene and trans-4-[2-(3-hydroxy)-thionaphthenyle]-2-oxo-3 butenoic acid, which are the main metabolites in the degradation of this compound.
Genotoxic activity of chlorinated butenoic acids in Salmonella typhimurium strains TA98, TA100, and TA104.