PROBLEM TO BE SOLVED: To provide nonpeptide, specific-binding glycoprotein antagonists used for positron emission tomography (PET) agents for imaging of thrombi in a mammalian body.SOLUTION: The present invention provides a compound represented by formula (III) {R3 is H, F, CF3 or the like; R7 is Y, -O(CH2) n-Y, -(OCH2CH2) m-Y or the like; X is CH or N; Y is 18F or F}.SELECTED DRAWING: None【課題】哺乳動物体内の血栓造影の為の陽電子放射断層撮影(PET)剤として用いられる非ペプチド性、特異的結合糖蛋白質拮抗物質であるフッ素含有化合物の提供。【解決手段】式(III)で表される化合物{R3はH、F、CF3等;R7はY、-O(CH2)n-Y、-(OCH2CH2)m-Y等;XはCH又はN;Yは18F又はF}【選択図】なし