2,2′-Bipyrazine

2,2,2,4′-Tetrafluoroacetophenone

α,α,α,4-Tetrafluoroacetophenone

2,3-Dichloropyridine-4-boronic acid MIDA ester

2,4-Dichloro-5-methoxypyrimidine

2,4-二氯-5-甲氧基嘧啶

2,4,5-Trimethylbenzaldehyde

2,4,5-三甲基苯甲醛

2-Fluoro-DL-α-phenylglycine

2-氟-DL-α-苯基甘氨酸

2-Fluorobenzenesulfonamide

2-氟苯磺酰胺

2-Hydroxymethyl-18-crown-6

2-羟甲基-18-冠-6

2-Isobutylthiazole

2-异丁基噻唑

3-(p-Tolyl)propionic acid

3-(4-甲苯)丙酸

3-Amino-5-bromopyridine

3-氨基-5-溴吡啶