Solvent Yellow 34

Auramine O free base is an imine belonging to the benzophenone imine class, substituted with two dimethylamino groups at positions 4 and 4'. Its hydrochloride salt is the biological stain 'auramine O'. It functions as a fluorochrome and histological dye. It is a tertiary amino compound, a substituted aniline, and the conjugate base of auramine O(1+).