(organic chemistry) The compound (3R,4S,5R)-5-amino-3,4-dihydroxycyclohex-1-enecarboxylic acid which is used in the synthesis of neuraminidase inhibitors, and is involved in the biosynthesis of ansamycins and mitomycins

(organic chemistry) An acid which occurs in opium and may be obtained by oxidizing narcotine.

(archaic, organic chemistry) An acid obtained when spermaceti, saponified by means of potash, is decomposed by an acid.

(chemistry) An acid obtained from hypogeic acid.

(chemistry) An acid obtained from atropine, and isomeric with cinnamic acid.

(chemistry) An acid (C₁₁H₁₂O₅) related to gallic acid, obtained by the decomposition of sinapine.

(chemistry) An acid found in the urine of neat cattle, probably identical with cresol.

(chemistry) An acid of titanium (H₂TiO₃), analogous to metasilicic acid.

(chemistry) An acid obtained by the decomposition of lupulin.

(organic chemistry) An organic acid of the tartaric acid series, distinct from lithofellic acid, but, like it, obtained from certain bile products, such as bezoar stones.