Assign(R)or(S) Working in 3D,rotate molecule so that lowest priority group is in back. Draw an arrow from highest to lowest priority group. Clockwise =(R),Counterclockwise=(S) rotate (S)enantiomer Copyright2005 Pearson Prentice Hall,Inc. 11 Chapter 5 11 Assign (R) or (S) • Working in 3D, rotate molecule so that lowest priority group is in back. • Draw an arrow from highest to lowest priority group. • Clockwise = (R), Counterclockwise = (S) =>