(biochemistry) A metabolite of tryptophan that has antiexcitotoxic and anticonvulsant activity.

(inorganic chemistry) A heteropoly acid formally derived from phosphoric acid and tungstic acid; it is used as an analytical reagent

(inorganic chemistry) Any of a family of mixed oxyacids of metals (such as tungsten) and nonmetals (such as phosphorus)

(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