Nice dayWe are tianjin kaiyuan chem. Co.,ltd from china .Our main products includePetrochemical,Pharmaceuticals ,and Electronics &OLED chemical materialfor example :2-Bromo-9,9'-spirobifluorene?9,9'-spirobi[fluoren]-2-ylboronic acid ? Dibenzothiophene-4-boronic acid and so on .Plstell us you need material english name ,CAS NO. and so on ,we are going to give a best price on the basic of fine quality .Waiting for your kind response .