4-(1,4-Dihydro-5-hydroxy-7-methyl-1,4-dioxo-2-naphthalenyl)-1a,7a-dihydro-3-hydroxy-5-methylnaphth(2,3-b)oxirene-2,7-dione 50886-69-6 Diosquinone NSC 342731 Naphth(2,3-b)oxirene-2,7-dione, 4-(1,4-dihydro-5-hydroxy-7-methyl-1,4-dioxo-2-naphthalenyl)-1a,7a-dihydro-3-hydroxy-5-methyl-