1) Acid ester
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https://www.crosswordclues.com/clue/lactone
Lactones are cyclic esters of hydroxycarboxylic acids, containing a 1-oxacycloalkan-2-one structure, or analogues having unsaturation or heteroatoms replacing one or more carbon atoms of the ring. Lactones are formed by intramolecular esterification of the corresponding hydroxycarboxylic acids, which takes place spontaneously when the ring that is...
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http://en.wikipedia.org/wiki/Lactone
• (n.) One of a series of organic compounds, regarded as anhydrides of certain hydroxy acids. In general, they are colorless liquids, having a weak aromatic odor. They are so called because the typical lactone is derived from lactic acid.
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http://thinkexist.com/dictionary/meaning/lactone/
any of a class of cyclic organic esters, usually formed by reaction of a carboxylic acid group with a hydroxyl group or halogen atom present in the ...
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http://www.britannica.com/eb/a-z/l/4
(lak´tōn) a cyclic organic compound in which the chain is closed by ester formation between a carboxyl and a hydroxyl group in the same molecule.
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http://www.encyclo.co.uk/local/21001
Lac'tone noun (Chemistry) One of a series of organic compounds, regarded as anhydrides of certain hydroxy acids. In general, they are colorless liquids, having a weak aromatic odor. They are so called because the typical lactone is derived from
lactic acid.
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http://www.encyclo.co.uk/webster/L/4
Type: Term Pronunciation: lak′tōn Definitions: 1. An intramolecular organic anhydride formed from a hydroxyacid by the loss of water between a hydroxyl and a -COOH group; a cyclic ester.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=47592
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