(2S)-2-amino-3-methyl-3-sulfanyl-butanoic acid 3-Mercapto-D-valine 3-Mercaptovaline 52-67-5 AIDS-000443 AIDS000443 Artamine Cuprenil Cuprimine D-(-)-Penicillamine Depen Distamine (*Hydrochloride*) Mercaptyl Metalcaptase (*Hydrochloride*) NSC81549 PCA Penicillamin Penicillamine Perdolat Sufortan Trolovol