Label each compound as R or S. a. b. c. d. Draw the two enantiomers of each compound and label them as R or S. a. b. Draw both enantiomers of fenfluramine, one component of the appetite suppressant Fen-Phen. The S enantiomer was sold independently under the name dexfenfluramine. Which enantiomer is dexfenfluramine? (Fen-Phen was withdrawn from the market in 1997, after it was shown to damage heart valves in some patients.)