D-Galacturonic acid
IUPAC name	(2S,3R,4S,5R)-2,3,4,5-Tetrahydroxy-6-oxo-hexanoic acid
Identifiers
CAS number	685-73-4
PubChem	84740
EC number	211-682-6
SMILES	C(=O)[C@@H]([C@H]([C@H]([C@@H](C(=O)O)O)O)O)O
Properties
Molecular formula	C6H10O7
Molar mass	194.139
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

D-Galacturonic acid is a sugar acid, an oxidized form of D-galactose. It is the main component of pectin, in which it exists as the polymer polygalacturonic acid. It has an aldehyde group at C1 and a carboxylic acid group at C6. Other oxidized forms of D-galactose are D-galactonic acid (carboxylic group at C1) and meso-galactaric acid (mucic acid) (carboxylic groups at C1 and C6). It is also a uronic acid or hexuronic acid. Naturally occurring uronic acids are D-glucuronic acid, D-galacturonic acid, L-iduronic acid and D-mannuronic acid.

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