己酮糖：一种六碳的酮糖。例如果糖。

Ketohexose a ketose SUGAR with six carbon atoms, e. g. fructose.

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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。

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.

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这样，最简单的酮糖HOCH 2 -C：O-CH 2 OH即为triulose（丙酮糖）；最常见得酮糖D-果糖（左旋糖）即为hexulose（己酮糖）。

Thus, the simplest ketose, HOCH2-C:O-CH2OH, is a triulose; the most common ketose, D-fructose (levulose), is a hexlose.

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