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decamethonium

deca·me·tho·ni·um

noun \ˌdek-ə-mə-ˈthō-nē-əm\

: a synthetic ion used especially in the form of its bromide C₁₆H₃₈Br₂N₂ or iodide C₁₆H₃₈I₂N₂ as a skeletal muscle relaxant

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