(1,1'-Biphenyl)-3-sulfonic acid, 4'-(acetylamino)-4-((3-aminobenzoyl)amino)- 4'-(Acetylamino)-4-((3-aminobenzoyl)amino)(1,1'-biphenyl)-3-sulphonic acid 4'-Acetylamino-4-(3''-aminobenzoylamino)-1,1'-diphenyl-3-sulfonic acid 68189-37-7 EINECS 269-194-4