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Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Penicillamine \Pen`i*cil"lam*ine\, n. (Chem., Med.)
      A substance (C5H11NO2S) which is a degradation product of
      the penicillins. Chemically it is 3-mercapto-D-valine. It has
      chelating properties and is used in medicine as an
      antirheumatic and to chelate copper in cases of
      hepatolenticular degeneration (Wilson's disease).
      [PJC]