:Ascorbyl stearate

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| ImageFile = Ascorbyl stearate.svg

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| IUPACName = L-threo-Hex-2-enono-1,4-lactone 6-octadecanoate

| SystematicName = (2S)-2-[(2R)-3,4-Dihydroxy-5-oxo-2,5-dihydrofuran-2-yl]-2-hydroxyethyl octadecanoate

| OtherNames = E305
L-Ascorbic acid, 6-octadecanoate
Ascorbyl monooctadecanoate

|Section1={{Chembox Identifiers

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| CASNo = 10605-09-1

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| UNII = 7Z1QT341US

| EINECS = 234-231-5

| PubChem = 54725318

| ChEMBL_Ref = {{ebicite|changed|EBI}}

| ChEMBL = 218804

| SMILES = OC([C@]([C@@H](O)COC(CCCCCCCCCCCCCCCCC)=O)([H])O1)=C(O)C1=O

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| ChemSpiderID = 18619275

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| StdInChI = 1S/C24H42O7/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-20(26)30-18-19(25)23-21(27)22(28)24(29)31-23/h19,23,25,27-28H,2-18H2,1H3/t19-,23+/m0/s1

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| StdInChIKey = LITUBCVUXPBCGA-WMZHIEFXSA-N

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|Section2={{Chembox Properties

| C=24 | H=42 | O=7

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|Section7={{Chembox Hazards

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Ascorbyl stearate (C₂₄H₄₂O₇) is an ester formed from ascorbic acid and stearic acid. In addition to its use as a source of vitamin C, it is used as an antioxidant food additive in margarine (E number E305). The USDA limits its use to 0.02% individually or in conjunction with other antioxidants.