Sodium sorbate is the sodium salt of sorbic acid. It is an unstable white solid. Unlike other sorbic acid salts such as potassium sorbate (E202) and calcium sorbate (E203), the use of sodium sorbate as a food additive is not allowed in the EU due to potential genotoxic effects.^[2][3]

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Sodium sorbate

Names
Preferred IUPAC name Sodium (2E,4E)-hexa-2,4-dienoate
Identifiers
CAS Number	7757-81-5 Y
3D model (JSmol)	Interactive image
ChemSpider	4938659 Y
ECHA InfoCard	100.028.927
E number	E201 (preservatives)
PubChem CID	23665582
UNII	TGW6Q2CCVM Y
CompTox Dashboard (EPA)	DTXSID8047181
InChI InChI=1S/C6H8O2.Na/c1-2-3-4-5-6(7)8;/h2-5H,1H3,(H,7,8);/q;+1/p-1/b3-2+,5-4+; Y Key: LROWVYNUWKVTCU-STWYSWDKSA-M Y InChI=1/C6H8O2.Na/c1-2-3-4-5-6(7)8;/h2-5H,1H3,(H,7,8);/q;+1/p-1/b3-2+,5-4+; Key: LROWVYNUWKVTCU-ZCSOUONQBK
SMILES [Na+].[O-]C(=O)\C=C\C=C\C
Properties
Chemical formula	C6H7NaO2
Molar mass	134.10835 g/mol
Odor	hydrocarbon-like
Boiling point	233 °C (451 °F; 506 K)[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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Its E-number is E201.