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|Section2= |Section5= |Section8= |Section6= |Section7= }} Salicylic acid (from Latin ''salix'', ''willow tree'', from the bark of which the substance used to be obtained) is a monohydroxybenzoic acid, a type of phenolic acid and a beta hydroxy acid. It has the formula C7H6O3. This colorless crystalline organic acid is widely used in organic synthesis and functions as a plant hormone. It is derived from the metabolism of salicin. In addition to being an important active metabolite of aspirin (''acetylsalicylic acid''), which acts in part as a prodrug to salicylic acid, it is probably best known for its use as a key ingredient in topical anti-acne products. The salts and esters of salicylic acid are known as salicylates. ==Chemistry== Salicylic acid has the formula C6H4(OH)COOH, where the OH group is ''ortho'' to the carboxyl group. It is also known as 2-hydroxybenzoic acid. It is poorly soluble in water (2 g/L at 20 °C).〔(【引用サイトリンク】title=Salicilyc acid )〕 Aspirin (acetylsalicylic acid or ASA) can be prepared by the esterification of the phenolic hydroxyl group of salicylic acid with the acetyl group from acetic anhydride or acetyl chloride. It can also be prepared using the Kolbe-Schmitt reaction. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「salicylic acid」の詳細全文を読む スポンサード リンク
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