. "hyl-diphenylamine 4-Bromo-2,5-diethoxy-diphenylamine 4-Nitro-diphenylamine Diphenylamine-4-sulfonic acid amide N-rnethyl-diphenylamine N-Benzyl-diphenylamine 4-Methoxy-N-benzyl-aniline m-Phenylene-diamine N,N-Dibutyryl-m-phenylene-diamine 1-Methyl-phenylene-diamine-( 3 ,5) 4-Amino-diphenyl 3-Amino-diphenylmethane HO U wherein R is a monovalent radical and s is a number from O to 4." . . .