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|Section2= |Section3= }} 4-Aminobenzoic acid (also known as ''para''-aminobenzoic acid or PABA because the number 4 carbon in the benzene ring is also known as the ''para'' position) is an organic compound with the formula H2NC6H4CO2H. PABA, a white-grey crystalline substance, is only slightly soluble in water. It consists of a benzene ring substituted with an amino group and a carboxyl group. ==Production and occurrence== In industry, PABA is prepared mainly by two routes: * Reduction of 4-nitrobenzoic acid * Hoffman degradation of the monoamide derived from terephthalic acid. Food sources of PABA include liver, brewer's yeast (and unfiltered beer), kidney, molasses, mushrooms, and whole grains.〔(Nutritional Health Resource )〕 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「4-Aminobenzoic acid」の詳細全文を読む スポンサード リンク
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