5-乙酰基水杨酸, 5-Acetylsalicylic Acid

2-乙酰基噻吩, 2-Acetylthiophene

N-乙酰基-L-色氨酸 甲酯, N-Acetyl-L-tryptophan methyl ester

反-乌头酸, trans-Aconitic Acid

3-(丙烯酰氧基)丙基三甲氧基硅烷, 3-(Acryloyloxy)propyltrimethoxysilane

1-金刚烷乙睛, 1-Adamantaneacetonitrile

1-金刚烷甲胺, 1-Adamantanemethylamine

腺嘌呤, Adenine

己二酸, Adipic Acid

琼脂, Agar