Mirror CHO CHO H-C-OH HO-C-H CHOH CH2OH D-Glyceraldehyde L-Glyceraldehyde CHO CHO Fischer projection formulas OH CHO CHO H-0-0H H0-0-H CH2OH CH2OH CH2OH CH2OH D-Glyceraldehyde 1-Glyceraldehyde Ball-and-stick models Perspective formulas