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L-Tartaric acid

Athanor · official

C4H6O6 · 150.09 g/mol

IUPAC name: (2R,3R)-2,3-dihydroxybutanedioic acid

Also called tartrate, 2,3-dihydroxybutanedioic acid, E334, cream of tartar acid

Reagents
Open in Athanor
The structure of L-Tartaric acid
Drawn from its SMILES with RDKit
CorrosiveHarmful or irritantDangerHarmful if swallowed · Causes skin irritation · May cause an allergic skin reaction · Causes serious eye damage · Causes serious eye irritation · May cause respiratory irritation

Names and identifiers

IUPAC name
(2R,3R)-2,3-dihydroxybutanedioic acid
Synonyms
tartrate, 2,3-dihydroxybutanedioic acid, E334
+ 39 more

cream of tartar acid, L-(+)-Tartaric acid, L(+)-Tartaric acid, tartaric acid, (2R,3R)-2,3-dihydroxysuccinic acid, (2R,3R)-2,3-dihydroxybutanedioic acid, (+)-Tartaric acid, (+)-L-Tartaric acid, (R,R)-Tartaric acid, Threaric acid, Dextrotartaric acid, L-threaric acid, Natural tartaric acid, (+)-(R,R)-Tartaric acid, (2R,3R)-Tartaric acid, Rechtsweinsaeure, Kyselina vinna, (R,R)-(+)-Tartaric acid, FEMA No. 3044, Weinsteinsaeure, Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, DTXSID8023632, L-2,3-Dihydroxybutanedioic acid, 1,2-Dihydroxyethane-1,2-dicarboxylic acid, (+)-Weinsaeure, NSC-62778, INS NO.334, INS-334, TARTARICUM ACIDUM, E-334, L-2,3-DIHYDROXYSUCCINIC ACID, W4888I119H, Butanedioic acid, 2,3-dihydroxy- (R-(R*,R*))-, CHEMBL1236315, E 334, CHEBI:15671, TARTARIC ACID (L(+)-), BAROS COMPONENT TARTARIC ACID, NSC-759609

Molecular formula
C4H6O6
Empirical formula
C2H3O3
Molecular weight
150.09 g/mol
Exact mass
150.01644
CAS number
87-69-4
PubChem CID
444305
Canonical SMILES
C(C(C(=O)O)O)(C(=O)O)O
Isomeric SMILES
[C@@H]([C@H](C(=O)O)O)(C(=O)O)O
InChI
InChI=1S/C4H6O6/c5-1(3(7)8)2(6)4(9)10/h1-2,5-6H,(H,7,8)(H,9,10)/t1-,2-/m1/s1
InChIKey
FEWJPZIEWOKRBE-JCYAYHJZSA-N
Molfile

Names, InChI and the identifiers from PubChem, retrieved 2026-10-14.

Physical properties

TemperaturePressureDensity
Appearance
Dry Powder[1]
2 values

From EPA Chemical Data Reporting (CDR), the most authoritative source here.

ValueAs writtenSource
–shownDry Powder[1] EPA Chemical Data Reporting (CDR)
–WHITE CRYSTALLINE POWDER.[2] ILO-WHO International Chemical Safety Cards (ICSCs)
Melting point
206 °C[2]
Density
1.76 @25 °C[3]
2 values

2 of 2 sources agree on it (most common value).

ValueAs writtenSource
–Relative density (water = 1): 1.79[2] ILO-WHO International Chemical Safety Cards (ICSCs)
–shown1.76 @25 °C[3] PAC Chemical Database, U.S. Department of Energy
Solubility in water
Solubility in water, g/l at 20 °C: 1400 (very soluble)[2]
log P
-0.76 (calculated)[2]
Flash point
210 °C c.c.[2]
Autoignition temperature
425 °C[2]

Each value as its source reports it, with the source's number after it (listed under References). Where several sources report a property, the row shows the value most of them agree on, the rule the app uses; open the values to see every one.

Calculated

Heavy atoms
10
Rings
0
Aromatic rings
0
Fraction sp³ carbons (Fsp3)
0.5
H-bond donors
4
H-bond acceptors
4 computed here · PubChem 6
Rotatable bonds
3
TPSA (Ų)
115.1 computed here · PubChem 115
Formal charge
0
XLogP3
-1.9 PubChem
Complexity
134 PubChem
Stereocenters
2 definedCIP: C2: R · C3: R
Double-bond geometry
None specified
Point group
C1 of one 3D conformer with its hydrogens, by Athanor’s engine (as in the app)

Elemental analysis

  • C32.01%
  • H4.03%
  • O63.96%

Isotope pattern

100%150.0164.6%151.0201.3%152.021

Each peak is a nominal mass with its abundance-weighted exact mass, as a percentage of the tallest, from IUPAC natural isotope abundances.

Computed from the structure with RDKit 2026.09 when this page was built, beside PubChem's own computed values from its record; where the two differ, both are shown.

Predicted

log P
-2.12 Crippen (Wildman and Crippen 1999)
log S (water solubility)
0.76 ESOL (Delaney 2004), log mol/L
Synthetic accessibility
3 SA score, 1 easy to 10 hard (Ertl and Schuffenhauer 2009)

Drug-likeness: Lipinski’s rule of five

  • Molecular weight ≤ 500: 150.09
  • log P ≤ 5 (Crippen): -2.12
  • H-bond donors ≤ 5: 4
  • H-bond acceptors ≤ 10: 4

Passes all four rules.

¹³C NMR shifts, predicted

Predictions, not measurements; each names its method. A measured log P, where a source reports one, is under Physical properties.

Safety

Danger

Most widely reported: 4,731 company reports to ECHA. Source [4].

  • Corrosive
  • Harmful or irritant
  • H302Harmful if swallowed (42.5% of reports)
  • H315Causes skin irritation (54.3% of reports)
  • H317May cause an allergic skin reaction (42.5% of reports)
  • H318Causes serious eye damage (41.2% of reports)
  • H319Causes serious eye irritation (57.8% of reports)
  • H335May cause respiratory irritation (55.4% of reports)

Precautionary statements: P261, P264, P264+P265, P270, P271, P272, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P305+P354+P338, P317, P319, P321, P330, P332+P317, P333+P317, P337+P317, P362+P364, P403+P233, P405, P501

View all classifications (4)
  • [4] European Chemicals Agency (ECHA)This chemical does not meet GHS hazard criteria for 0.9% (44 of 4731) of reports.
  • [4] European Chemicals Agency (ECHA) · 4,731 reports · DangerH302, H315, H317, H318, H319, H335
  • [4] European Chemicals Agency (ECHA)This chemical does not meet GHS hazard criteria for 5.1% (26 of 506) of reports.
  • [4] European Chemicals Agency (ECHA) · 506 reports · DangerH315, H318, H319, H335

Exposure limits

  • MAK (Maximale Arbeitsplatz Konzentration): 2 mg/m[2]

First aid

  • Fresh air, rest. Seek medical attention if you feel unwell.[2]
  • Remove contaminated clothes. Rinse skin with plenty of water or shower.[2]
  • Rinse with plenty of water for several minutes (remove contact lenses if easily possible). Refer immediately for medical attention.[2]
  • Rinse mouth. Give one or two glasses of water to drink. Seek medical attention if you feel unwell.[2]

Storage

  • Store only in original packaging.[2]

Safety data sheets on the supplier’s page: Alfa Chemistry, BLD Pharm, Mcule.

Always read the supplier’s safety data sheet before working with it.

Spectra

Experimental spectra held by these sources; each link opens the source's own record.

Literature

Reading PubChem, OpenAlex and GSRS…

Bioactivity

Reading ChEMBL…

References

  1. [1]EPA Chemical Data Reporting (CDR) · Public domain (US EPA) · via PubChem · retrieved 2026-10-14
  2. [2]ILO-WHO International Chemical Safety Cards (ICSCs) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
  3. [3]PAC Chemical Database, U.S. Department of Energy · Public domain (US DOE) · via PubChem · retrieved 2026-10-14
  4. [4]European Chemicals Agency (ECHA) · ECHA legal notice: reuse with acknowledgement · via PubChem · retrieved 2026-10-14
  5. [5]Human Metabolome Database (HMDB) · Linked only · via PubChem · retrieved 2026-10-14
  6. [6]SpectraBase · Linked only · via PubChem · retrieved 2026-10-14
  7. [7]MassBank Europe · Linked only · via PubChem · retrieved 2026-10-14
  8. [8]MassBank of North America (MoNA) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
  9. [9]NIST Mass Spectrometry Data Center · Linked only · via PubChem · retrieved 2026-10-14
  10. ·Calculated values: computed by Athanor with RDKit 2026.09 from the structure.
  11. ·Literature on PubChem

Data last updated 2026-10-14.