Heneicosylic acid, or heneicosanoic acid, is the organic compound with the formula CH₃(CH₂)₁₉CO₂H. It is the straight-chain 21-carbon saturated fatty acid. It is a colorless solid.

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Heneicosylic acid

Names
Preferred IUPAC name Henicosanoic acid
Other names Heneicosylic acid
Identifiers
CAS Number	2363-71-5 Y
3D model (JSmol)	Interactive image
ChemSpider	16012
ECHA InfoCard	100.017.377
PubChem CID	16898
UNII	NRY04FUK8H Y
CompTox Dashboard (EPA)	DTXSID0021595
InChI InChI=1S/C21H42O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21(22)23/h2-20H2,1H3,(H,22,23) Key: CKDDRHZIAZRDBW-UHFFFAOYSA-N InChI=1S/C21H42O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21 (22)23/h2-20H2,1H3,(H,22,23) Key: CKDDRHZIAZRDBW-UHFFFAOYSA-N
SMILES CCCCCCCCCCCCCCCCCCCCC(=O)O
Properties
Chemical formula	C21H42O2
Molar mass	326.55 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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It has shown relevance in the production of foams, paints, and related viscous materials.^[1] A laboratory preparation involves permanganate oxidation of 1-docosene (CH₃(CH₂)₁₉CH=CH₂).^[2]

• List of saturated fatty acids
• Very long chain fatty acids
• List of carboxylic acids