In the following model, the carbon atoms are dark gray, hydrogen is cyan and oxygen is red. There is only one chiral center (C-2) and it is shown in the D-configuration.
Show Spacefill Model
Show Stick Model
In the following model, the carbon atoms are dark gray, hydrogen is cyan and oxygen is red. There are two chiral centers (C-2 & C-3). The molecule is shown in an eclipsed conformation that reflects the Fischer projection formula, even though this is relatively unstable. The configuration at the center farthest from the carbonyl group (C-3) determines the D or L classification. This carbon may be identified by clicking the first button below (it will be colored magenta).
Identify D-Designating Carbon