tubocurarine chloride

A toxic compound of the alkaloid class obtained chiefly from the bark and stems of a South American vine (Chondrodendron tomentosum of the family Menispermaceae) that in its dextrorotatory form constitutes the chief active constituent of curare and used in the form of its hydrated hydrochloride C₃₇H₄₁ClN₂O₆·HCl·5H₂O to produce relaxation of voluntary muscles before surgery and in tetanus, encephalitis, and poliomyelitis.