P 1464 (OTTO) 9,10-Phenanthrenequinone, 80%+ Cas 84-11-7 - used to study DNA-protein interactions. P 1464 (OTTO) 9,10-Phenanthrenequinone, 80%+ Cas 84-11-7 - used for high quality passivation on silicon (100) surfaces. Quinones may serve as substrates for a variety of flavoenzymes, useful fluorescent compound and quinone.