Isanic acid

Isanic acid
Names
	IUPAC name octadec-17-en-9,11-diynoic acid
	Other names Erythrogenic acid
Identifiers
CAS Number	506-25-2 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:197116;
ChemSpider	4472111;
PubChem CID	5312686;
UNII	JEO6512256;
CompTox Dashboard (EPA)	DTXSID701304957;
	InChI InChI=1S/C18H26O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h2H,1,3-6,11-17H2,(H,19,20) Key: OASRDXXKKGHDJZ-UHFFFAOYSA-N;
	SMILES OC(=O)CCCCCCCC#CC#CCCCCC=C;
Properties
Chemical formula	C18H26O2
Molar mass	274.404 g·mol−1
Appearance	crystalline platelets or prisms, light-sensitive; turns red
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Isanic acid or erythrogenic acid is a linear fatty acid composed of 18 carbon atoms, with two triple bonds in the positions 9≡10 and 11≡12 and a double bond in the position 17=18. This is one of the rare polyacetylenic acids with conjugated triple bonds. Its delta notation is 18:3Δ9a,11a,17. Its structural formula is CH₂=CH-(CH₂)₄–C≡C–C≡C–(CH₂)₇–COOH.

Exocarpic acid is isomeric to isanic acid. The related isanolic acid, unlike isanic acid, contains an additional hydroxyl group. The oxygenated isanic acid is called ketoisanic acid.