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D-Galacturonic acid

Chemical compound
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. In its open form, it has an aldehyde group at C1 and a carboxylic acid group at C6. Wikipedia
Molar mass: 194.139 g/mol
Formula: C6H10O7
Melting point: 159 °C (318 °F; 432 K)