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Indolequinones are molecules which are based upon an indole but have two additional ketone groups (quinone) 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.
References
Indolequinone Wikipedia(Text) CC BY-SA