古洛糖是一种己醛糖。古洛糖是一种非自然的单糖，呈浆状并有甜味。它能溶于水，微溶于甲醇。D型和L型均不能被酵母发酵。

古洛糖是半乳糖的C-3差向异构体。

果聚糖： 菊粉 · 果聚糖β2→6

甘露聚糖

半乳聚糖

Gulose is an aldohexose sugar. It is a monosaccharide that is very rare in nature, but has been found in archaea, bacteria and eukaryotes. It also exists as a syrup with a sweet taste. It is soluble in water and slightly soluble in methanol. Both the D- and L-forms are not fermentable by yeast.