右旋糖 is an old term found in chemistry literature; nowadays it is more often called ブドウ糖.
Common katakana loanword for dextrose, especially in food and pharmaceutical labeling.
Compound of 右旋 (right-handed rotation, referring to optical activity) and 糖 (sugar). The term is a direct calque from the concept of dextrose, which rotates plane-polarized light to the right.