oxythiamine

noun
oxy·​thi·​a·​mine | \-ˈthī-ə-mən, -ˌmēn \
variants: also oxythiamin \-​mən \

Medical Definition of oxythiamine 

: a chemical compound C12H16ClN3O2S that differs from thiamine in having the amino group in the pyrimidine ring replaced by a hydroxyl group and that is a thiamine antagonist producing symptoms of thiamine deficiency

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