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bu•ta•bar'bi•tal so'dium

Pronunciation: (byOO"tu-bär'bi-tôl", -tal"), [key] Pharm.
a barbiturate, C₁₀H₁₅N₂NaO₃, used as a sedative and hypnotic. Also called sodium butabarbital.

but

butadiene

Dictionary

bu•ta•bar'bi•tal so'dium

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