Examples from the Web for quinone
Phenanthrene forms a quinone which has been utilized as a source of colouring-matters, but these are comparatively unimportant.
The various pathological conditions mentioned before may be ascribed to irritation caused by quinone di-imine.Principles and Practice of Fur Dressing and Fur Dyeing|William E. Austin
The so-called chrysophanic acid found in Xanthoria (Physcia) parietina is not an acid but a quinone and is better termed physcion.
Thus there is quinone itself, or benzoquinone, which is benzene with two atoms of oxygen replacing two atoms of hydrogen.
The compound is readily prepared by the action of sulphurous acid or any other reducing agent on the quinone.