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It was erroneously stated in "Poisoning With Barbituric Acid Derivatives" (Queries and Minor Notes, The Journal, March 13, 1937, p. 908) that metrazol is a soluble camphor derivative. Metrazol is a synthetic, organic chemical compound; namely, pentamethylentetrazol.
Metrazol. JAMA. 1937;108(14):1187. doi:10.1001/jama.1937.02780140043018