(organic chemistry) An organic acid obtained from several lichens (Lecanora, Roccella, etc.).

(organic chemistry) The partial ethyl ester of sulfuric acid, H.C₂H₅.SO₄, produced as a thick liquid by the action of sulphuric acid on alcohol

(organic chemistry) A brown resinous substance resembling tannin, extracted from the henna plant (Lawsonia inermis).

(organic chemistry) cetrarin

(chemistry) A complex nitrogenous acid obtained by decomposition of melam, or of urea, as a white crystalline powder.

(organic chemistry) The phenolic carboxylic acid 3,4-dihydroxybenzoic acid that is a major metabolite of polyphenols

(chemistry) A compound consisting of a double fluoride of hydrogen and silicon; silicofluoric acid.

(chemistry) A complex ketonic acid, C₅H₆O₃.

(obsolete, organic chemistry) sarcolactic acid

(chemistry) Any of three isomeric crystalline acids, C₉H₁₀ON.CO₂H, which are toluyl derivatives of glycocoll.