硫代硫酸铵, Ammonium thiosulfate

烷异英, Anisoin

3-(9-蒽基)丙酸, 3-(9-Anthryl)propionic acid

碲化锑(III), Antimony(III) telluride

L-精氨酸, L-Arginine

硫化砷(III), Arsenic(III) sulfide

L-(+)-天冬酰胺酸,一水合物, L-(+)-Asparagine monohydrate

L-Aspartic Acid Di-tert-butyl Ester Hydrochloride

1-偶氮-15-冠-5, 1-Aza-15-crown-5

6-氮杂胸腺嘧啶, 6-Azathymine