D-tagatose, a rare natural hexoketose, is one of the rare sugars, which are defined as monosaccharides and their derivatives that rarely exist in nature.
塔格糖是一种在自然界中较为稀有的天然己酮糖，属于稀少糖的一种，稀少糖是指在自然界存在但含量极少的一类单糖。
On a molecular level, D-tagatose is structurally identical to D-fructose, except for an inversion of the hydroxyl and hydrogen groups at the fourth carbon atom.
塔格糖是果糖的“差向异构体”，在分子水平上，除了第四个碳原子上的羟基和氢基团倒置外，D -塔格糖与D -果糖的结构是一样的。
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