title: Preparation of optically active 6-chlorotryptophan and tryptophan.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002713:Chlorine; D003460:Crystallization; D008698:Mesylates; D009904:Optical Rotation; D010636:Phenols; D013237:Stereoisomerism; D013451:Sulfonic Acids; D013549:Sweetening Agents; D014364:Tryptophan / Q000031:analogs & derivatives / Q000302:isolation & purification
chemical_list: D008698:Mesylates; D010636:Phenols; D013451:Sulfonic Acids; D013549:Sweetening Agents; D002713:Chlorine; D014364:Tryptophan