13471-78-8 20166-17-0 3-(4-Amino-2-methyl-5-pyrimidinylmethyl)-5-(2-chloroethyl)-4-methylthiazoliumhydroxide Beclotiamine Thiazolium, 3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2-chloroethyl)-4-methyl-