n :  a toxic alkaloid that is obtained chiefly from the bark and stems of a So. American vine (Chondrodendron tomentosum of the family Menispermaceae), that in its dextrorotatory form constitutes the chief active constituent of curare, and that is used in the form of its hydrated hydrochloride C₃₇H₄₁ClN₂O₆·HCl·5H₂O esp. as a skeletal muscle relaxant .
 
   
 
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