Diazodiphenylmethane (CAS NO.883-40-9), its Synonyms are (Diazo-phenyl-methyl)benzene ; 1,1'-(Diazomethylene bisbenzene ; Diazodiphenylmethane ; Intermediateofcefoselissulfate ; Bis(phenyl)diazomethane . It is black and red crystals.