N,N'-DIACETYL-4,4'-DIAMINODIPHENYLMETHANE
N,N'-DIACETYL-4,4'-DIAMINODIPHENYLMETHANE ??
??
N,N'-DIACETYL-4,4'-DIAMINODIPHENYLMETHANE C??? ??, ??, ??
N,N'-DIACETYL-4,4'-DIAMINODIPHENYLMETHANE ?? ?? ? ???
???
?? ??
N,N'-DIACETYL-4,4'-DIAMINODIPHENYLMETHANE ?? ??
???( 0)?? ??