Indolequinones
Image:Mitomycin.svg|thumb|Mitomycin
Image:Apaziquone.svg|thumb|Apaziquone
Indolequinones are molecules which are based upon an indole but have two additional ketone groups attached to the ring structure.
This simple indolequinone indole-5,6-quinone is produced during the ripening of some fruit.
Other examples of indolequinones and the related mitosenes include natural compound mitomycin and the related chemotherapeutic agent apaziquone.