1 KWG 3-(phenylethynyl)-2-(1h-pyrrol-1-yl)benzoic acid 1.000 2 A1I1W 2-hydroxy-5-(phenylethynyl)benzoic acid 0.739 3 XOS 3-[(E)-2-(4-hydroxyphenyl)ethenyl]benzoic acid 0.739 4 XLO 3-[(E)-2-(2-chloro-4-hydroxyphenyl)ethenyl]benzoic acid 0.708