欧美天堂一区二区三区四区,久久久久888,操逼老熟女视频,舔阴蒂,三级片视频片段

White to light yellow crystals or lumps with a characteristic odor, melting point:78 ~ 80 ℃, boiling point: 195 ~ 196 ℃, ignition:191 ℃, soluble in water, ethanol, ether, benzene and other organic solvents.

The for use is to produce pyrazinamide, isonicotinic acid and rimifon. Besides, it also can be used as intermediates in the agrochemical and pharmaceutical industries for producting composite pyridine derivatives.