^Dextrose is indeed a sugar. It is a monosaccharide. It is simply an isomer of glucose. You can make a structural argument for maltodextrin, but practically it is simply a chain of d-glucose (see dextrose) that absorbs about as quickly as the glucose standard.

dextrose is used in candy and sports drinks. 80 grams of dextrose is a bit much... Probably the equivalent of drinking a 50 oz of gatorade.