PROBLEM TO BE SOLVED: To provide a thrombogenesis preventive, acting by a new mechanism different from Warfarin, that is, capable of exhibiting ADAMTS13-like effects, and having a low molecular weight of <500.SOLUTION: The thrombogenesis preventive includes a compound represented by formula (1) (wherein, R1 is selected from H, O and CnH2n+1, R2 is CmH2m+1 having one or two hydroxy substituents n is an integer of 1-3 and m is an integer of 3-6) as an active ingredient.COPYRIGHT: (C)2013,JPO&INPIT【課題】ワーファリンとは異なる新規なメカニズム、すなわちADAMTS13様の効果を発揮しうる,分子量500未満の低分子の血栓形成予防薬の提供。【解決手段】下記式(1)(式中R1は,H,O,CnH2n+1のいずれかから選択され,R2は,1又は2個のヒドロキシル置換基を有するCmH2m+1。nは1から3であって,mは3から6で表される整数。)で表される化合物を有効成分とすることを特徴とする血栓形成予防薬。【選択図】図1