6-HYDROXY-2-NAPHTHOIC ACID (2:6 BON ACID)

BROMAMINE ACID

META PHENYLENE DIAMINE-4-SULPHONIC ACID

N METHYL ANILINE

TOBIAS ACID

H ACID

J ACID

K ACID

MIXED CLEVES ACID

3,3′-DICHLOROBENZIDINE DIHYDROCHLORIDE（DCB）

1,2-BIS-(O-AMINOPHENOXY)ETHANE