O-Dianisidine

"o"-Dianisidine is an organic compound with the formula [(CH3O)(H2N)C6H3]2. A colorless or white solid, it is a bifunctional compound derived via the benzidine rearrangement from "o"-anisidine.
"o"-Dianisidine is a precursor to some azo dyes by formation of the bis(diazonium) derivative, which is coupled to diverse aromatic compounds. Some commercial dyes derived from "o"-dianisidine include C. I. Direct Blue 1, 15, 22, 84, and 98. 
"o"-Dianisidine is also used in assaying activity of peroxidase in lab. The general reaction of a peroxidase is as follows.
Where the ROOR' can be hydrogen peroxide, and the electron doner be "o"-dianisidine.
Safety.
The manufacture and degradation of "o"-dianisidine, like other benzidene derivatives, has attracted regulatory attention. It is also used as a reagent in biochemistry in testing for peroxides.