Fisher Projection
Assigning (R) and (S) Configurations from Fischer Projections
Cahn–Ingold–Prelog convention
• Assign priorities to the groups bonded to the asymmetric carbon atom
• Put the lowest-priority group (usually H) in back, and draw an arrow from group 1 to group 2
to group 3. Clockwise is (R), and counterclockwise is (S).