Erythrose and Threose CHO CHO H OH HO H H一OH OH CH,OH CH,OH D-(-)-erythrose D-(-)-threose Erythrose is an aldotetrose with the OH groups of its two asymmetric carbons on the same side of the Fischer projection. Threose is the diastereomer with the OH groups on opposite sides of the Fischer projection. Chapter 23 9 Chapter 23 9 Erythrose and Threose ▪ Erythrose is an aldotetrose with the OH groups of its two asymmetric carbons on the same side of the Fischer projection. ▪ Threose is the diastereomer with the OH groups on opposite sides of the Fischer projection. D-(-)-erythrose D-(-)-threose