title: The acid strength of the sulfhydryl and ammonium groups in L-cysteine and D-penicillamine; the determination of the micro acid stability constants.
mesh_terms: D003545:Cysteine / Q000032:analysis*; D004355:Drug Stability; D010396:Penicillamine / Q000032:analysis*; D000644:Quaternary Ammonium Compounds / Q000032:analysis*; D013438:Sulfhydryl Compounds / Q000032:analysis*
chemical_list: D000644:Quaternary Ammonium Compounds; D013438:Sulfhydryl Compounds; D010396:Penicillamine; D003545:Cysteine