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Keywords: Butobarbital OR 77-28-1 OR butethal OR 5-Butyl-5-ethyl-2,4,6(1H,3H,5H)pyrimidinetrione OR 5-Butyl-5-ethyl-2,4,6(1H,3H,5H)-pyrimidinetrione OR 5-Butyl-5-ethyl-4,6-dihydroxy-2(5H)-pyrimidinone OR 5-Butyl-5-ethylpyrimidine-2,4,6(1H,3H,5H)-trione
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