1. The method of Zima for synthesizing thiamine monophosphate disulfide (TMPDS) was studied and improved in several points. 2. The products obtained by the authors were somewhat different in physical and chemical properties. 3. TMPDS was shown to give polymorplism, i.e., α-, β- and γ-forms. They have different color, water of crystallization, decomposition points and infra-red absorption spectra.
