(1,1'-Biphenyl)-4,4'-disulfonic acid5314-37-431 % similar 1-Amino-2-naphthol-4-sulfonic acid116-63-230 % similar 2-Amino-1-naphthol-4-sulfonic acid567-13-530 % similar 4-Amino-2,5-dichlorobenzenesulfonic acid88-50-630 % similar 2,5-Diamino-1,3-benzenedisulfonic acid6409-48-930 % similar