Catsyn offer gram to tons of 4,4,5,5-Tetramethyl-2-(spiro[fluorene-9,9'-xanthen]-2'-YL)-1,3,2-dioxaborolane | CAS 2106888-79-1, its formula is C31H27BO3, molecular weight is 458.36g/mol and the purity is usually NLT 98%.