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 .
稀少糖