ORGANIC CHEMISTRY Chapter 14 o Three amino acids necessary for protein synthesis contain an aromatic ring CHCHCO2 CH CHCO2 HO CH,CHCO? NH3 NH +NH3 H Phenylalanine苯丙氨酸 Tyrosine酪氨酸 Tryptophan色氨酸 o Derivatives of purine and pyrimidine are essential parts of dna and rna N N NNH Purine嘌呤 Pyrimidine嘧啶 Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 14 Three amino acids necessary for protein synthesis contain an aromatic ring: CH2CHCO2 NH3 CH2CHCO2 NH3 HO Phenylalanine Tyrosine N H CH2CHCO2 NH3 苯丙氨酸 酪氨酸 Tryptophan 色氨酸 Derivatives of purine and pyrimidine are essential parts of DNA and RNA. N N N N H N N Purine 嘌呤 Pyrimidine 嘧啶