Worked Example 21.1 Assigning R or S Configuration to a Fischer Projection Going from first-to second-to third-highest priority requires a counterclockwise turn,corresponding to S stereochemistry 4 4 H H H 2H02C NH21= 2 HO2C-C-NH2 H3C--C--NH2 CH3 CH3 HO2C 3 →3 S configuration▪ Going from first- to second- to third-highest priority requires a counterclockwise turn, corresponding to S stereochemistry Worked Example 21.1 Assigning R or S Configuration to a Fischer Projection