Synthesis of acetic acid

Preparation of acetic acid

Preparation of acetic acid

Preparation of acetic acid

20 g of ethyl acetate are refluxed with 80 g (excess) of 25% aqueous potassium hydroxide for 1 hour, until the layer of ester has disappeared, and the mixture no longer smells of it. Th whole is then distilled to 100° C; ethyl alcohol can be separated from the distillate by addition of anhydrous potassium carbonate. The residue in the flask is neutralised with dilute sulphuric acid and evaporated to dryness on a water bath. The solid residue is powdered and distilled with 50 g of conc. sulphuric acid to 130° C, and the distillate fractionated between 115-120° C. Cooling in ice until solidification takes place, and subsequently draining away the still-liquid portion, gives crystals of glacial acetic acid. Yield 90%. Colourless liquid or crystals; characteristic odour; miscible with water; m.p. 16.7° C; b.p. 119° C; d=1.055 g/ml at 15° C.

Systematic organic chemistry, by W. M. Cumming, 241, 1937.

Preparation of acetic acid

Preparation of acetic acid

To 80 g of finely powdered potassium dichromate (or sodium dichromate), and 100 g of 50% sulphuric acid, are slowly mixed with 70 g of 25% alcohol. The mixture is heated under reflux for 30 minutes and distilled until only very little acetic acid passes over. The distillate is neutralised with potassium hydroxide, and evaporated to dryness on a water bath. The residue is powdered and distilled with conc. sulphuric acid to 139° C, and the distillate fractionated between 115-120° C. Yield 80%.

Systematic organic chemistry, by W. M. Cumming, 248-249, 1937.

IUPAC Name

acetic acid

InChI

InChI=1S/C2H4O2/c1-2(3)4/h1H3,(H,3,4)

InChI Key

QTBSBXVTEAMEQO-UHFFFAOYSA-N

Canonical SMILES

CC(=O)O

MeSH Synonyms

Acetic Acid, Acetic Acid Glacial, Acetic Acid, Glacial, Acid Glacial, Acetic, Acid, Acetic, Acid, Glacial Acetic, Glacial Acetic Acid, Glacial, Acetic Acid, Vinegar

Depositor-Supplied Synonyms

acetic acid, ethanoic acid, Ethylic acid, Vinegar acid, Methanecarboxylic acid, Glacial acetic acid, 64-19-7, Acetasol, Acetic acid, glacial, Essigsaeure, Acide acetique, Acetic acid glacial, Kyselina octova, Aci-jel, Azijnzuur, Vinegar, Acido acetico, Octowy kwas, Pyroligneous acid, AcOH, HOAc, Azijnzuur [Dutch], Essigsaeure [German], Ethanoic acid monomer, Caswell No. 003, aceticacid, Octowy kwas [Polish], Acetic acid (natural), Ethylate, acetyl alcohol, ethoic acid, Glacial acetate, Acide acetique [French], Acido acetico [Italian], Kyselina octova [Czech], Otic Domeboro, Methanecarboxylate, Acetic acid, water solutions, ethanoate, FEMA Number 2006, CH3-COOH, UN2789, UN2790, CHEMBL539, EPA Pesticide Chemical Code 044001, NSC 132953, BRN 0506007, HSDB 40, UNII-Q40Q9N063P, AI3-02394, FEMA No. 2006, CCRIS 5952, CHEBI:15366, QTBSBXVTEAMEQO-UHFFFAOYSA-N, Carboxymethyl Group, EINECS 200-580-7, Shotgun, Acetic acid solution, Acetic acid, diluted, Acetic acid [JAN], E260, WLN: QV1, Acetic acid solution, not less than 50% but more than 80% acid, by mass [UN2790] [Corrosive], Acetic acid solution, with more than 10% and less than 50% acid, by mass [UN2790] [Corrosive], Acetic acid, glacial or acetic acid solution, >80% acid, by mass [UN2789] [Corrosive], Acetic acid, of a concentration of more than 10 per cent, by weight, of acetic acid, Acetic acid, aqueous solution, 68475-71-8, 77671-22-8, ACY, Somatrel, Volsol, acetic-acid, Orlex, Vosol, Ghrh acetate, Glacial Acetic, Grf sumitomo, acetic -acid, acetic acid-, cellulose diacetate, Somatorelin acetate, Acetasol (TN), MeCOOH, Cellulose, diacetate, Vinegar (Salt/Mix), MeCO2H, methane carboxylic acid, CH3COOH, PubChem22173, Acetate standard for IC, AC1Q2BPJ, METHYL, CARBOXY-, Carboxylic acids, C2-3, 10.Methanecarboxylic acid, CH3CO2H, DSSTox_CID_4394, bmse000191, bmse000817, bmse000857, Otic Domeboro (Salt/Mix), Somatorelin acetate [JAN], AC1L18NC, Acetic acid (JP16/NF), ACMC-1B1E4, DSSTox_RID_77386, NCIOpen2_000659, NCIOpen2_000682, UNII-XY920R6F5N, DSSTox_GSID_24394, Acetic acid, glacial (USP), Glacial acetic acid (JP16), KSC491S8N, UN 2790 (Salt/Mix), 40273_ALDRICH, 46928_SUPELCO, A8976_FLUKA, W200603_ALDRICH, W200611_ALDRICH, INS No. 260, Somatorelin acetate [WHO-DD], 27218_RIEDEL, 27225_RIEDEL, 318590_ALDRICH, 33206_RIEDEL, 33209_RIEDEL, 34254_RIEDEL, 34255_RIEDEL, 34256_RIEDEL, 38050_RIEDEL, 38051_RIEDEL, 40209_RIEDEL, 40273_RIEDEL, A6283_SIAL, A8976_SIAL, A9967_SIAL, GTPL1058, 07692_FLUKA, 13669_FLUKA, 34254_FLUKA, 34255_FLUKA, 34256_FLUKA, 38050_FLUKA, 38051_FLUKA, 45725_FLUKA, 45725_SIGMA, 45726_FLUKA, 45726_SIGMA, 45730_FLUKA, 45732_FLUKA, 45754_FLUKA, 49199_FLUKA, 71251_FLUKA, CTK3J1986, HMDB00042, 318590_FLUKA, ACETIC ACID, GLACIAL, ACS, MolPort-000-871-575, 27218_SIAL, 27225_SIAL, 33206_SIAL, 33209_SIAL, 45754_SIAL, Q40Q9N063P, Acetic acid, glacial [USAN:JAN], 242853_SIAL, 320099_SIAL, 338826_SIAL, 380121_SIAL, 537020_SIAL, Acetic acid, Glacial, ACS Reagent, ZINC5224164, Tox21_301453, ANW-41557, ANW-44008, BDBM50074329, LMFA01010002, NSC132953, NSC406306, STL264240, TCLP extraction fluid 2 (Salt/Mix), Acetic acid, propionic acid distillate, AKOS000268789, LS-1541, LS-2535, MCULE-8295936189, NSC-132953, NSC-406306, RL04447, RTR-021046, Sodium acetate, anhydrous or trihydrate, UN 2789, CAS-64-19-7, TRA-0196378, Acetic acid 0.25% in plastic container, NCGC00255303-01, AN-41867, BC253535, C2:0, IN012302, KB-47052, MO 08470, OR034264, OR034746, TR-021046, TR-021753, 612-EP0930075A1, 612-EP1441224A2, 612-EP2269610A2, 612-EP2269977A2, 612-EP2269978A2, 612-EP2269985A2, 612-EP2269986A1, 612-EP2269988A2, 612-EP2269989A1, 612-EP2269990A1, 612-EP2269991A2, 612-EP2269992A1, 612-EP2269993A1, 612-EP2269994A1, 612-EP2269998A2, 612-EP2270001A1, 612-EP2270002A1, 612-EP2270006A1, 612-EP2270008A1, 612-EP2270010A1, 612-EP2270011A1, 612-EP2270012A1, 612-EP2270013A1, 612-EP2270014A1, 612-EP2270015A1, 612-EP2270016A1, 612-EP2270018A1, 612-EP2270113A1, 612-EP2270505A1, 612-EP2272509A1, 612-EP2272516A2, 612-EP2272517A1, 612-EP2272537A2, 612-EP2272813A2, 612-EP2272817A1, 612-EP2272822A1, 612-EP2272825A2, 612-EP2272827A1, 612-EP2272831A1, 612-EP2272832A1, 612-EP2272834A1, 612-EP2272835A1, 612-EP2272841A1, 612-EP2272842A1, 612-EP2272847A1, 612-EP2272848A1, 612-EP2272849A1, 612-EP2272935A1, 612-EP2272972A1, 612-EP2272973A1, 612-EP2274983A1, 612-EP2275102A1, 612-EP2275105A1, 612-EP2275401A1, 612-EP2275403A1, 612-EP2275404A1, 612-EP2275407A1, 612-EP2275409A1, 612-EP2275410A1, 612-EP2275411A2, 612-EP2275412A1, 612-EP2275413A1, 612-EP2275414A1, 612-EP2275417A2, 612-EP2275420A1, 612-EP2275421A1, 612-EP2275469A1, 612-EP2277507A1, 612-EP2277622A1, 612-EP2277848A1, 612-EP2277858A1, 612-EP2277861A1, 612-EP2277862A2, 612-EP2277864A1, 612-EP2277866A1, 612-EP2277867A2, 612-EP2277871A1, 612-EP2277872A1, 612-EP2277874A1, 612-EP2277875A2, 612-EP2277877A1, 612-EP2277878A1, 612-EP2277880A1, 612-EP2277881A1, 612-EP2279750A1, 612-EP2280000A1, 612-EP2280001A1, 612-EP2280003A2, 612-EP2280004A1, 612-EP2280006A1, 612-EP2280008A2, 612-EP2280009A1, 612-EP2280010A2, 612-EP2280012A2, 612-EP2280013A1, 612-EP2280020A1, 612-EP2280021A1, 612-EP2281563A1, 612-EP2281813A1, 612-EP2281815A1, 612-EP2281817A1, 612-EP2281818A1, 612-EP2281819A1, 612-EP2281820A2, 612-EP2281821A1, 612-EP2281823A2, 612-EP2281824A1, 612-EP2284146A2, 612-EP2284147A2, 612-EP2284149A1, 612-EP2284150A2, 612-EP2284151A2, 612-EP2284152A2, 612-EP2284153A2, 612-EP2284155A2, 612-EP2284156A2, 612-EP2284157A1, 612-EP2284159A1, 612-EP2284160A1, 612-EP2284161A1, 612-EP2284162A2, 612-EP2284163A2, 612-EP2284164A2, 612-EP2284167A2, 612-EP2284168A2, 612-EP2284169A1, 612-EP2284170A1, 612-EP2284174A1, 612-EP2284178A2, 612-EP2284179A2, 612-EP2284920A1, 612-EP2286795A1, 612-EP2286811A1, 612-EP2287140A2, 612-EP2287147A2, 612-EP2287148A2, 612-EP2287150A2, 612-EP2287152A2, 612-EP2287153A1, 612-EP2287155A1, 612-EP2287156A1, 612-EP2287160A1, 612-EP2287161A1, 612-EP2287162A1, 612-EP2287163A1, 612-EP2287165A2, 612-EP2287166A2, 612-EP2287167A1, 612-EP2287940A1, 612-EP2289509A2, 612-EP2289510A1, 612-EP2289518A1, 612-EP2289868A1, 612-EP2289876A1, 612-EP2289879A1, 612-EP2289883A1, 612-EP2289885A1, 612-EP2289890A1, 612-EP2289892A1, 612-EP2289893A1, 612-EP2289894A2, 612-EP2289897A1, 612-EP2289965A1, 612-EP2292088A1, 612-EP2292227A2, 612-EP2292228A1, 612-EP2292231A1, 612-EP2292233A2, 612-EP2292234A1, 612-EP2292576A2, 612-EP2292586A2, 612-EP2292589A1, 612-EP2292590A2, 612-EP2292592A1, 612-EP2292593A2, 612-EP2292595A1, 612-EP2292596A2, 612-EP2292597A1, 612-EP2292599A1, 612-EP2292602A1, 612-EP2292603A1, 612-EP2292604A2, 612-EP2292606A1, 612-EP2292610A1, 612-EP2292611A1, 612-EP2292615A1, 612-EP2292617A1, 612-EP2292619A1, 612-EP2292620A2, 612-EP2292621A1, 612-EP2292622A1, 612-EP2292628A2, 612-EP2295053A1, 612-EP2295055A2, 612-EP2295401A2, 612-EP2295402A2, 612-EP2295406A1, 612-EP2295409A1, 612-EP2295411A1, 612-EP2295412A1, 612-EP2295413A1, 612-EP2295414A1, 612-EP2295415A1, 612-EP2295416A2, 612-EP2295417A1, 612-EP2295418A1, 612-EP2295419A2, 612-EP2295421A1, 612-EP2295423A1, 612-EP2295425A1, 612-EP2295426A1, 612-EP2295427A1, 612-EP2295430A2, 612-EP2295431A2, 612-EP2295432A1, 612-EP2295433A2, 612-EP2295434A2, 612-EP2295437A1, 612-EP2295438A1, 612-EP2295439A1, 612-EP2295441A2, 612-EP2295503A1, 612-EP2298312A1, 612-EP2298729A1, 612-EP2298731A1, 612-EP2298734A2, 612-EP2298735A1, 612-EP2298742A1, 612-EP2298743A1, 612-EP2298744A2, 612-EP2298745A1, 612-EP2298746A1, 612-EP2298747A1, 612-EP2298748A2, 612-EP2298750A1, 612-EP2298754A1, 612-EP2298755A1, 612-EP2298756A1, 612-EP2298757A2, 612-EP2298758A1, 612-EP2298759A1, 612-EP2298761A1, 612-EP2298763A1, 612-EP2298766A1, 612-EP2298767A1, 612-EP2298768A1, 612-EP2298770A1, 612-EP2298771A2, 612-EP2298772A1, 612-EP2298775A1, 612-EP2298776A1, 612-EP2298777A2, 612-EP2298778A1, 612-EP2298779A1, 612-EP2298780A1, 612-EP2298828A1, 612-EP2301533A1, 612-EP2301534A1, 612-EP2301536A1, 612-EP2301538A1, 612-EP2301544A1, 612-EP2301912A2, 612-EP2301916A2, 612-EP2301918A1, 612-EP2301922A1, 612-EP2301923A1, 612-EP2301928A1, 612-EP2301929A1, 612-EP2301931A1, 612-EP2301933A1, 612-EP2301934A1, 612-EP2301935A1, 612-EP2301937A1, 612-EP2301938A1, 612-EP2301939A1, 612-EP2301940A1, 612-EP2301983A1, 612-EP2302382A2, 612-EP2302383A2, 612-EP2305219A1, 612-EP2305248A1, 612-EP2305250A1, 612-EP2305254A1, 612-EP2305257A1, 612-EP2305260A1, 612-EP2305627A1, 612-EP2305633A1, 612-EP2305636A1, 612-EP2305637A2, 612-EP2305640A2, 612-EP2305641A1, 612-EP2305643A1, 612-EP2305646A1, 612-EP2305647A1, 612-EP2305648A1, 612-EP2305649A1, 612-EP2305650A1, 612-EP2305651A1, 612-EP2305652A2, 612-EP2305653A1, 612-EP2305654A1, 612-EP2305655A2, 612-EP2305657A2, 612-EP2305659A1, 612-EP2305660A1, 612-EP2305662A1, 612-EP2305663A1, 612-EP2305664A1, 612-EP2305666A1, 612-EP2305667A2, 612-EP2305668A1, 612-EP2305670A1, 612-EP2305671A1, 612-EP2305672A1, 612-EP2305673A1, 612-EP2305674A1, 612-EP2305675A1, 612-EP2305676A1, 612-EP2305678A1, 612-EP2305679A1, 612-EP2305681A1, 612-EP2305682A1, 612-EP2305683A1, 612-EP2305684A1, 612-EP2305687A1, 612-EP2305689A1, 612-EP2305695A2, 612-EP2305696A2, 612-EP2305697A2, 612-EP2305698A2, 612-EP2305769A2, 612-EP2305808A1, 612-EP2305825A1, 612-EP2308479A2, 612-EP2308492A1, 612-EP2308510A1, 612-EP2308562A2, 612-EP2308812A2, 612-EP2308828A2, 612-EP2308831A1, 612-EP2308833A2, 612-EP2308838A1, 612-EP2308839A1, 612-EP2308841A2, 612-EP2308842A1, 612-EP2308847A1, 612-EP2308848A1, 612-EP2308849A1, 612-EP2308850A1, 612-EP2308851A1, 612-EP2308854A1, 612-EP2308855A1, 612-EP2308857A1, 612-EP2308858A1, 612-EP2308861A1, 612-EP2308864A1, 612-EP2308865A1, 612-EP2308867A2, 612-EP2308869A1, 612-EP2308870A2, 612-EP2308872A1, 612-EP2308873A1, 612-EP2308874A1, 612-EP2308875A1, 612-EP2308877A1, 612-EP2308879A1, 612-EP2308880A1, 612-EP2308882A1, 612-EP2308883A1, 612-EP2308960A1, 612-EP2309584A1, 612-EP2311451A1, 612-EP2311453A1, 612-EP2311455A1, 612-EP2311494A1, 612-EP2311796A1, 612-EP2311797A1, 612-EP2311798A1, 612-EP2311799A1, 612-EP2311801A1, 612-EP2311802A1, 612-EP2311803A1, 612-EP2311805A1, 612-EP2311806A2, 612-EP2311807A1, 612-EP2311808A1, 612-EP2311809A1, 612-EP2311810A1, 612-EP2311811A1, 612-EP2311814A1, 612-EP2311816A1, 612-EP2311817A1, 612-EP2311818A1, 612-EP2311820A1, 612-EP2311821A1, 612-EP2311822A1, 612-EP2311823A1, 612-EP2311824A1, 612-EP2311825A1, 612-EP2311826A2, 612-EP2311827A1, 612-EP2311829A1, 612-EP2311830A1, 612-EP2311831A1, 612-EP2311834A1, 612-EP2311835A1, 612-EP2311837A1, 612-EP2311838A1, 612-EP2311839A1, 612-EP2311840A1, 612-EP2311842A2, 612-EP2311850A1, 612-EP2314295A1, 612-EP2314571A2, 612-EP2314574A1, 612-EP2314575A1, 612-EP2314576A1, 612-EP2314577A1, 612-EP2314578A1, 612-EP2314579A1, 612-EP2314581A1, 612-EP2314582A1, 612-EP2314583A1, 612-EP2314585A1, 612-EP2314586A1, 612-EP2314587A1, 612-EP2314588A1, 612-EP2314589A1, 612-EP2314590A1, 612-EP2314593A1, 612-EP2315303A1, 612-EP2316450A1, 612-EP2316452A1, 612-EP2316457A1, 612-EP2316458A1, 612-EP2316459A1, 612-EP2316824A1, 612-EP2316825A1, 612-EP2316826A1, 612-EP2316827A1, 612-EP2316828A1, 612-EP2316829A1, 612-EP2316831A1, 612-EP2316834A1, 612-EP2316835A1, 612-EP2316836A1, 612-EP2316837A1, 612-EP2316905A1, 612-EP2316906A2, 612-EP2316937A1, 612-EP2371797A1, 612-EP2371798A1, 612-EP2371799A1, 612-EP2371800A1, 612-EP2371802A1, 612-EP2371803A1, 612-EP2371804A1, 612-EP2371810A1, 612-EP2371811A2, 612-EP2371814A1, 612-EP2372017A1, 612-EP2374454A1, 612-EP2374526A1, 612-EP2374538A1, 612-EP2374786A1, 612-EP2374895A1, 612-EP2377510A1, 612-EP2377842A1, 612-EP2377843A1, 612-EP2380568A1, 612-EP2380661A2, 612-EP2380867A1, 612-EP2380874A2, E 260, E-260, FT-0613051, FT-0619087, FT-0621735, FT-0638674, FT-0659639, Y1308, 8426-EP2269978A2, 8426-EP2269985A2, 8426-EP2269991A2, 8426-EP2270001A1, 8426-EP2270006A1, 8426-EP2272509A1, 8426-EP2272825A2, 8426-EP2272848A1, 8426-EP2275102A1, 8426-EP2275105A1, 8426-EP2275403A1, 8426-EP2275413A1, 8426-EP2275421A1, 8426-EP2277848A1, 8426-EP2277867A2, 8426-EP2277874A1, 8426-EP2280003A2, 8426-EP2280008A2, 8426-EP2281819A1, 8426-EP2284150A2, 8426-EP2284151A2, 8426-EP2284152A2, 8426-EP2284153A2, 8426-EP2284155A2, 8426-EP2284156A2, 8426-EP2284157A1, 8426-EP2284164A2, 8426-EP2286811A1, 8426-EP2286812A1, 8426-EP2287140A2, 8426-EP2287148A2, 8426-EP2287150A2, 8426-EP2287156A1, 8426-EP2289893A1, 8426-EP2292589A1, 8426-EP2292593A2, 8426-EP2292603A1, 8426-EP2292604A2, 8426-EP2295409A1, 8426-EP2295410A1, 8426-EP2295412A1, 8426-EP2295413A1, 8426-EP2295419A2, 8426-EP2295428A2, 8426-EP2295432A1, 8426-EP2295433A2, 8426-EP2295437A1, 8426-EP2295503A1, 8426-EP2298312A1, 8426-EP2298743A1, 8426-EP2298762A2, 8426-EP2298770A1, 8426-EP2298775A1, 8426-EP2298776A1, 8426-EP2298780A1, 8426-EP2298783A1, 8426-EP2301928A1, 8426-EP2301930A1, 8426-EP2301933A1, 8426-EP2301940A1, 8426-EP2305250A1, 8426-EP2305637A2, 8426-EP2305640A2, 8426-EP2305660A1, 8426-EP2305682A1, 8426-EP2305689A1, 8426-EP2305695A2, 8426-EP2305696A2, 8426-EP2305697A2, 8426-EP2305698A2, 8426-EP2308840A1, 8426-EP2308841A2, 8426-EP2308861A1, 8426-EP2308867A2, 8426-EP2308870A2, 8426-EP2308879A1, 8426-EP2311806A2, 8426-EP2311807A1, 8426-EP2311808A1, 8426-EP2311818A1, 8426-EP2311826A2, 8426-EP2311829A1, 8426-EP2311831A1, 8426-EP2311840A1, 8426-EP2311842A2, 8426-EP2314295A1, 8426-EP2314576A1, 8426-EP2314586A1, 8426-EP2316824A1, 8426-EP2316831A1, 8426-EP2316834A1, C00033, D00010, 12812-EP2295402A2, 12812-EP2316470A2, 12812-EP2316831A1, 4-02-00-00094 (Beilstein Handbook Reference), A834671, 3B4-0958, I04-9818, I14-60089, InChI=1/C2H4O2/c1-2(3)4/h1H3,(H,3,4, Somatoliberin (human pancreatic islet), acetate (salt), UNII-N4G9GAT76C component QTBSBXVTEAMEQO-UHFFFAOYSA-N, Acetic acid, glacial or acetic acid solution, >80% acid, by mass, ACETIC ACID-1-13C, D4, 99 ATOM % 13C, 98 ATOM % D, Acetic acid solution, not less than 50% but more than 80% acid, by mass, Acetic acid solution, with more than 10% and less than 50% acid, by mass, Acetic acid, glacial or acetic acid solution, >80% acid, by mass [UN2789] [Corrosive], 157090-22-7, 207004-55-5, 248587-59-9, 834904-91-5, 9035-69-2

Removed Synonyms

acetate, Barium acetate, Otic Tridesilon, succinic acid, Sodium acetate, Molybdic acid, Unknown Ligand, Mixture Name, Oxytocin acetate, Acetate Ion, Acid, Acetic, component of Aci-Jel, Acid Glacial, Acetic, Acid, Glacial Acetic, Glacial, Acetic Acid, ACETYL GROUP, acetic acid ammonium salt, Otic Tridesilon (Salt/Mix), CID176, component of Aci-Jel (Salt/Mix), A2035, D019342, 543-80-6, 631-61-8, 1563-79-7, 6233-83-6, 7782-91-4, ACE, ACT, CBM, CM, SIN, Symlin|||L-Lysyl-L-cysteinyl-L-asparaginyl-L-threonyl-L-alanyl-L-threonyl-L-cysteinyl-L-alanyl-L-threonyl-L-glutaminyl-L-arginyl-L-leucyl-L-alanyl-L-asparaginyl-L-phenylalanyl-L-leucyl-L-valyl-L-histidyl-L-seryl-L-seryl-L-asparaginyl-L-asparaginyl-L-phenylalanylglycyl-L-prolyl-L-isoleucyl-L-leucyl-L-prolyl-L-prolyl-L-threonyl-L-asparaginyl-L-valylglycyl-L-seryl-L-asparaginyl-L-threonyl-L-tyrosinamide, cyclic (2-7)-disulfide, acetate (1:?), UNL

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