1 DMB 2-((3',5'-dimethyl-4'-hydroxyphenyl)azo)benzoic acid 1.000 2 MHB 2-((3'-methyl-4'-hydroxyphenyl)azo)benzoic acid 0.950 3 55R 2-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]benzoic acid 0.900 4 HAB 2-((4'-hydroxyphenyl)-azo)benzoic acid 0.900 5 MTB 2-((3'-tertbutyl-4'-hydroxyphenyl)azo)benzoic acid 0.826 6 MOB 2-((3',5'-dimethoxy-4'-hydroxyphenyl)azo)benzoic acid 0.750 7 NAB 2-((4'-hydroxynaphthyl)-azo)benzoic acid 0.750 8 NSL 4-hydroxyazobenzene 0.750 9 MRE 2-(4-dimethylaminophenyl)diazenylbenzoic acid 0.739