Parasorbic acid

Parasorbic acid is the cyclic lactone of sorbic acid.

Thermal treatment or hydrolysis converts the lactone to sorbic acid.

[1] Parasorbic acid is toxic and causes indigestion and nausea, however cooking and exposure to moisture convert it to the benign food preservative sorbic acid.

[2]

Skeletal formula of parasorbic acid
Ball-and-stick model of the parasorbic acid molecule
NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuel Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code