Benzothiophene 1,1-dioxide825-44-5100 % similar C.I. Fluorescent brightener 35138775-22-341 % similar Tinopal cbs27344-41-838 % similar Sodium 2-formylbenzenesulfonate1008-72-636 % similar Dibenzothiophene sulfone1016-05-334 % similar Dibenzazepine256-96-230 % similar