(organic chemistry) An analogue of acetic acid in which two of the three hydrogen atoms of the methyl group are replaced by chlorine.

(organic chemistry) A cyclic fatty acid, 2-cyclopentene-1-tridecanoic acid, obtained from chaulmoogra seeds, used in the treatment of leprosy.

A bacteriostatic antibiotic that is often used topically in creams and eyedrops but may also be given systemically as tablets or injections.

(pharmacology) A crystalline antibiotic C₁₇H₂₀O₆ obtained from fungi of the genus Penicillium, used as an immunosuppressant drug to prevent rejection in organ transplants.

(pharmacology) A bisphosphonate C₄H₁₃NO₇P₂ used to inhibit bone resorption especially in the treatment of osteoporosis in postmenopausal women and Paget's disease of bone. Trade names include Fosamax and possibly others.

a natural acid, found in the plant genus Spiraea (spirea)

Malonic acid.

(organic chemistry) A dicarboxylic acid, HO₂C(CH₂)₅CO₂H, whose derivatives are involved in the biosynthesis of lysine.

(organic chemistry) 4-oxopentanoic acid, a keto acid used as a synthetic intermediate.

(obsolete, organic chemistry) acid of milk, lactic acid