Wiktionary
phenanthrenequinone
n. (context organic compound English) Any of several isomeric quinones derived from phenanthrene, but especially ''9,10-phenanthrenequinone‎'' obtained by oxidation with chromic acid
Wikipedia
Phenanthrenequinone
Phenanthrenedione is a cytotoxic derivative of the polycyclic aromatic hydrocarbon phenanthrene.