(1)Benzopyrano(5,4,3-cde)(1)benzopyran-5,10-dione, 2,7-dinitro- 2,7-DN-Dpp 2,7-Dinitro-(1)benzopyrano(5,4,3-cde)(1)benzopyran-5,10-dione 2,7-Dinitro-5,10-dioxo-4,9-dioxapyrene 62925-34-2