Example: Consider the naturally occurring amino acid,alanine,and its enantiomer (1 NH2 (2) 白 H CH3 H (4) (3) (3) (4) unnatural natural alanine alanine (1) (1) NH2 NH2 c-C CO2H HO2C-C CH3 (3) (2) ( (3) (R)enantiomer (S)enantiomer Ch05 Stereochemistry (landscape) Page 9 Ch05 Stereochemistry (landscape) Page 9 Example: Consider the naturally occurring amino acid, alanine, and its enantiomer. NH2 C H CO2H C* NH2 H3C CO2H * NH2 C H HO2C C* NH2 HO2C CH3 * (R) enantiomer (S) enantiomer CH3 H3C (1) (2) (3) (4) (1) (4) (2) (3) (1) (1) (3) (2) (2) (3) unnatural alanine natural alanine