664345-18-0

BSBF 2,2''-Bi-9,9'-spirobi[9H-fluorene] 2-(9,9''-SPIROBIFLUOREN-2-YL)-9,9''-SPIROBIFLUORENE BSBF , 2-(9,9'-Spirobifluoren-2-yl)-9,9'-spirobifluorene 2,2''-Bi-9,9'-spirobi[9H-fluorene] (This product is only available in Japan.)