D 2287 (OTTO) N,N'-Diphenyl benzidine, GR 99% Cas 531-91-9 - used as intermediates in organic synthesis. D 2287 (OTTO) N,N'-Diphenyl benzidine, GR 99% Cas 531-91-9 - used as a OLED and liquid crystal intermediate, also as a disinfectant or organic synthesis intermediate.