(organic chemistry) The compound inositol hexaphosphoric acid' present in cereals etc as alkali and alkaline earth salts; it is a source of phosphorus for ruminants but is indigestible for carnivores

(organic chemistry) dimethylarsenic acid, (CH₃)₂AsO-OH, whose derivatives, the cacodylates, were once used as herbicides

(pharmacology) A beta-lactam compound C₈H₉NO₅ produced by the bacterium Streptomyces clavuligerus that is a beta-lactamase inhibitor and is usually used in the form of its clavulanate salt of potassium especially in combination with amoxicillin.

(organic chemistry) Any derivative of undecanoic acid in which one of the hydrogen atoms of the chain has been replaced with a mercaptan (-SH) group, but especially 11-mercaptoundecanoic acid which is used in the preparation of nanocomposite materials

(medicine) Any of a group of beta-lactam antibiotics originally obtained from Streptomyces bacteria

(organic chemistry) A nonionic surfactant used in biochemical research.

(organic chemistry) A lactam form of the amino acid glutamic acid

(organic chemistry) The keto carboxylic acid, (CH₃)₂-CO-COOH, that is a metabolite of valine

(organic chemistry) Any of several oxalo- derivatives of crotonic acid, but especially 4-oxalocrotonic acid, COOH-CO-CH₂-CH=CH-COOH, which has a biochemical function.

(chemistry) Any carboxylic acid in which a halogen atom takes the place of a hydrogen atom in acetic acid; a common undesirable by-product of the chlorination of drinking water.