... ,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-urea can be used as intermediates to sy Our product ... the best,4-(3-(2-fluoro-5-methylphenyl)ureido)phenylboronic acid is about 0.3% ,Any impurities not more than0.2 ... %,1-(5-Fluoro-2-methyl-phenyl)-3-[4-(4,4,5,5-tetramethyl-[1,3,2 ...