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Asparagusic acid, S2(CH2)2CHCO2H is an organosulfur carboxylic acid
Carboxylic acid

Carboxylic acids are organic acids characterized by the presence of a carboxyl group, which has the Chemical formula -COH, usually written -COOH or -CO2H....
 present in the vegetable asparagus
Asparagus

Asparagus officinalis is a flowering plant species in the genus Asparagus from which the vegetable known as asparagus is obtained....
 and may be the metabolic precursor to other odorous thiol compounds. Biosynthetic studies revealed that asparagusic acid is derived from isobutyric acid
Isobutyric acid

Isobutyric acid, also known as 2-methylpropanoic acid, is a carboxylic acid with structural formula 2-CH-carboxyl group. It is found in the free state in carobs and in the root of Arnica dulcis, and as an ethyl ester in croton oil....
. This colorless solid has a m.p. of 75.7-76.5 °C. The corresponding dithiol (m.p. 59.5-60.5 °C) is also known; it is called dihydroasparagusic acid or dimercaptoisobutyric acid.








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Asparagusic acid, S2(CH2)2CHCO2H is an organosulfur carboxylic acid
Carboxylic acid

Carboxylic acids are organic acids characterized by the presence of a carboxyl group, which has the Chemical formula -COH, usually written -COOH or -CO2H....
 present in the vegetable asparagus
Asparagus

Asparagus officinalis is a flowering plant species in the genus Asparagus from which the vegetable known as asparagus is obtained....
 and may be the metabolic precursor to other odorous thiol compounds. Biosynthetic studies revealed that asparagusic acid is derived from isobutyric acid
Isobutyric acid

Isobutyric acid, also known as 2-methylpropanoic acid, is a carboxylic acid with structural formula 2-CH-carboxyl group. It is found in the free state in carobs and in the root of Arnica dulcis, and as an ethyl ester in croton oil....
. This colorless solid has a m.p. of 75.7-76.5 °C. The corresponding dithiol (m.p. 59.5-60.5 °C) is also known; it is called dihydroasparagusic acid or dimercaptoisobutyric acid.

Isolation

From 40 kg of "asparagus aroma concentrate," Jansen obtained 32 g of a compound he identified as 3,3’-dimercaptoisobutyric acid.