o- anisidine

/o- an·is·i·dine/ (ah-nis´ĭ-dēn) a yellow to red oily aromatic amine used as an intermediate in the manufacture of azo dyes; it is an irritant and carcinogen.
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1] for PPy is due to the N-H stretching vibration peaks and indicates the presence of -NH group in the o-anisidine and pyr-role units [26].
The rule would list non-waste waters from the production of certain dyes, pigments and FD&C colorants as hazardous waste under the Resource Conservation and Recovery Act (RCRA) if these wastes contain certain levels of o-anisidine, p-cresidine, 1,2-phenylenediamine, 1,3-phenylenediamine, 2,4-dimethylaniline, and toluene-2,4-diamine.