There are 19 possible disaccharides of D-glucopyranose.
D-glucopyranose exists in both and forms.
The glycosidic bond can be formed between the anomeric hydroxyl group on one glucose unit and any hydroxyl group on the other glucose unit.
The possible linkages are:
-Glucose + -Glucose
-Glucose + -Glucose
-Glucose + -Glucose
-Glucose + -Glucose
So there are 19 possible disaccharides of D-glucopyranose.

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