AIDS-156961 AIDS156961 Benzenesulfonic acid, 3,3'-[azobis[(2-sulfo-4,1-phenylene)(E)-2,1-ethenediyl(3-sulfo-4,1-phenylene)azo]]bis[6-[(E)-2-(4-amino-2-sulfophenyl)ethenyl]-, compd. with methanaminium, N,N,N-trimethyl- (1:1) NSC633422