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Stereoisomer Notation in Monosaccharides

The yellow shaded box contains the structure of a pyranose aldohexose. Beneath that are the structures of four different stereoisomers, labled A through D. The questions posed below the formulas concern the structural relationship of the shaded reference structure to each of the other four.

Chair structure of a reference pyranose aldohexose (yellow box) above four stereoisomers labeled A-D

1. Which of the formulas (A to D) is an anomer of the reference structure? Enter appropriate letters or X for none
2. Which of the formulas (A to D) is an epimer of the reference structure? Enter appropriate letters or X for none
3. Which of the formulas (A to D) is a diastereomer of the reference structure? Enter appropriate letters or X for none