“The present study showed that one of the … from fern 3, 4-dihydroxycinnamic acid caffeic acid ) and catechol distributed … accelerated decomposition of thiamine at pH 7-7.5 into 2-methyl-4-amino-5-aminomethyl-pyrimidine, … the thiazole moiety, probably into γ-aceto-γ-mercapto-propylalcohol and formic acid.”