Assign Priorities 0、20H C 3C..H4 H3C NH2 natural alanine H expands to H 4 H *C CH(CH3)2 CH(CH3)2 CH2OH H CH2OH 2 c-0 Chapter 5 8Chapter 5 8 Assign Priorities C C O OH H3C NH2 H natural alanine 1 2 3 4 Cl Cl H H * 1 2 3 4 1 2 3 4 => C C O H C H CH2 CH2OH CH(CH3) 2 * C C C CH2OH CH(CH3 ) 2 H O O C C H CH2 C * expands to