Rumenic acid, also known as bovinic acid, is a conjugated linoleic acid (CLA) found in the fat of ruminants and in dairy products. It is an omega-7 trans fatty acid. Its lipid shorthand name is cis-9, trans-11 18:2 acid. The name was proposed by Kramer et al. in 1998.^[1] It can be considered as the principal dietary form, accounting for as much as 85-90% of the total CLA content in dairy products.^[2]

Quick Facts Names, Identifiers ...

Rumenic acid

Names
Preferred IUPAC name (9Z,11E)-Octadeca-9,11-dienoic acid
Other names Bovinic acid; C9-T11 acid
Identifiers
CAS Number	2540-56-9 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:32798 N
ChemSpider	4444245 N
KEGG	C04056 N
PubChem CID	5280644
UNII	46JZW3MR59 Y
CompTox Dashboard (EPA)	DTXSID1041003
InChI InChI=1S/C18H32O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h7-10H,2-6,11-17H2,1H3,(H,19,20)/b8-7+,10-9- N Key: JBYXPOFIGCOSSB-GOJKSUSPSA-N N InChI=1/C18H32O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h7-10H,2-6,11-17H2,1H3,(H,19,20)/b8-7+,10-9- Key: JBYXPOFIGCOSSB-GOJKSUSPBK
SMILES CCCCCC\C=C/C=C/CCCCCCCC(=O)O
Properties
Chemical formula	C18H32O2
Molar mass	280.452 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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Rumenic acid is produced from vaccenic acid by the action of unsaturase enzymes.^[3] Rumenic acid is converted back to vaccenic acid en route to stearic acid

F. Destaillats; E. Buyukpamukcu; P.-A. Golay; F. Dionisi & F. Giuffrida (2005). "Letter to the Editor: Vaccenic and Rumenic Acids, A Distinct Feature of Ruminant Fats". Journal of Dairy Science. 88 (449): 449. doi:10.3168/jds.S0022-0302(05)72705-3. PMID 15653508.