oxy·thi·a·mine | \ -ˈthī-ə-mən 
, -ˌmēn \
, -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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