S-Benzoyl derivative of thiamine such as BTMP is de-S-benzoylated to change into TMP by L-homocysteine or sodium thioglycollate in place of L-cysteine and has thiamine activity on Lactobacillus fermenti 36. It is not so by the reducing agents such as sodium thiosulfate, sodium hydrosulfite or thiourea. The mechanism of de-S-benzoylation of S-benzoyl derivatives of thiamine by SH-compounds is not reduction but translation of benzoyl group into SH-compounds.
