fructose and dextrose are identical chemically (the same number of hydogens, carbons and oxygens atoms,) both are sugars.

dextrose is called dextrose because it causes polorized light to bend to the right, (polorized light passed through fructose bends left)

(dextrose was first isolated by processing corn starch (with sulfuric acid, as i recall) to create corn syrup (15 to 23% dextrose) since the first attempts, processing has improved, and now HDCS-- high dextrose corn syrup- can be as much as 90% dextrose.

like fructose, dextrose seems sweeter than common sugar (sucrose).