COOEt O HCHO COOEt O COOH HC-NH-CCH HOHC-C-NH-CCHS →HOH2C-CHNH2 COOEt OH COOEt 丝胺酸 t9 COOEt Q CH2N(CH3)2 HC-NH-CCH3 COOEt OH COOEt NH2 1)H20 CH2-CH-COOH 2)-C02 色胺酸 Organic ChemOrganic Chem HCHO OH COOEt C COOEt NH CCH3 O HOH2 C H3O －CO2 COOH HOH2 C CHNH2 COOEt HC COOEt NH CCH3 O N H CH2 N(CH3 ) 2 N H CH2 COOEt C COOEt NH CCH3 O 1) H2O 2) －CO2 N H CH2 CH NH2 COOH 色胺酸 COOEt HC COOEt NH CCH3 O 丝胺酸 OH -