(Phthalein)又譯作𨣏,在狹義上是一分子鄰苯二甲酸酐(酞酐)與兩分子類經縮合得到的化合物的統稱,屬於三芳基甲烷類,其中有很多可用作染料。

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酞的結構通式。

酞在廣義上指的是所有具有右圖結構的有機化合物,其中 R1、R2 可以是原子或烴基。最簡單的酞是苯酞

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