structure of sugars and amino acids are written on the basis of structure of glyceraldehyde and attachment of H and OH at penultimose carbon .
CHO CHO
| |
H___C___OH HO_____C____H
| |
CH2OH CH2OH
D-glyceraldehyde L-glyceraldehyde
just like above if in glucose if H& OH attached to penultimose carbon(adjacent to CH2OH group)then named as D-glucose.
thanks®ards
kamlesh kumar
askiitians faculty