氨基酸的旋光异构体 COOH COOH COOH COOH HN-C-H H-C-NHs HgN-C-H H-C-NHs HC一C-H H-C-CHs H-C-CHs HyC-C-H C2Hs C2Hs C2Hs C2Hs L-Isoleucine p-Isoleucine L-Alloisoleucine D-Alloisoleucine (2.S,3.S)-Isoleucine (2R,3R)-Isoleucine (2.S.3R)-Isoleucine (2R,3S)-Isoleucine COOH COOH COOH COOH HaN-C-H H-C-NHs HaN-C-H H-C-NHg H一C一OH HO-C一H HO-C-H H一C一OH CH3 CHs CHs CHs L-Threonine D-Threonine L-Allothreonine D-Allothreonine 6 氨基酸的旋光异构体