1 NAB 2-((4'-hydroxynaphthyl)-azo)benzoic acid 1.000 2 55R 2-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]benzoic acid 0.818 3 HAB 2-((4'-hydroxyphenyl)-azo)benzoic acid 0.818 4 MHB 2-((3'-methyl-4'-hydroxyphenyl)azo)benzoic acid 0.783 5 DMB 2-((3',5'-dimethyl-4'-hydroxyphenyl)azo)benzoic acid 0.750 6 ORI 4-[(E)-(4-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonic acid 0.731