cis-4-Hydroxy-D-proline belongs to the class of organic compounds known as proline and derivatives. Proline and derivatives are compounds containing proline or a derivative thereof resulting from a reaction of proline at the amino group or the carboxyl group or from the replacement of any hydrogen of glycine by a heteroatom.

Keto-pantoyllactone is assayed by the ketopantoyl lactone-dependent oxidation of nicotinamide adenine dinucleotide phosphate.

Angelic acidis amonocarboxylicunsaturated organic acid. Angelic acid esters are the active components of herbal medicine used against a wide range of various health disturbances including pains, fever, gout, heartburn, etc.