suō[1][2](英语:carboxyl group),化学式–C(=O)OH[3],是羧酸所具有的官能团。一般而言,羧基上的有较大的电离倾向,从而使羧酸在水溶液中显酸性羧酸根负离子所具有共轭结构可以看作是氢易电离的潜在动力。

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羧基

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