Abstract
The structure of the substance (I), m. p. 113°, obtained on the application of benzenesulfonyl chloride to thiamine in alkaline medium, was examined and it was named thiamine anhydride by presumption of its structure. Its vitamin B1 action using rats was tested and its effect was about 1/100 of thiamine hydrochloride. In vitro treatment with liver slices made the compound show slight thiamine reaction but only around 1/200. It did not return to thiamine with cysteine or Takadiastase.
