2-Naphthalenesulfonic acid, 7-[[4-[(4-aminobenzoyl)amino]benzoyl]amino]-4-hydroxy- 2-Naphthalenesulfonic acid, 7-[p-(p-aminobenzamido)benzamido]-4-hydroxy- 91-45-2 NSC1741 p-Aminobenzoyl PAB-J acid