More important, and a new generation of organic acids, such as acetic acid, pyrrole-carboxylic acid, oxalic acid, malic acid, citric acid, and so on.

• 更重要的是，又生成了新的有机酸，如乙酸、吡咯酮羧酸、草酸、苹果酸、柠檬酸等。