Two styrylbenzene derivatives,(E, E)-1-fluoro-2, 5-bis-(3-hydroxycarbonyl-4-hydroxy) styrylbenzene (FSB) and (E, E)-1-bromo-2, 5-bis (3-hydroxycarbonyl-4-hydroxy) styrylbenzene-α, α′-13C2 ([13C] BSB), were synthesized for use as a histochemical stain to detect amyloid plaques of Alzheimer's disease (AD) brain sections. An analysis of fluorescence spectra demonstrated that FSB shows approximately twofold fluorescence ...