1-Isonicotinoyloxy-3-(2'-fluoro-4''-biphenylyl)butanone-(2) 3-(2'-Fluoro(1,1'-biphenyl)-4-yl)-2-oxobutyl 4-pyridinecarboxylate 4-Pyridinecarboxylic acid, 3-(2'-fluoro(1,1'-biphenyl)-4-yl)-2-oxobutyl ester 55418-56-9