1,4-Naphthoquinone, 2,3-epoxy-2,3-dihydro-2-methyl- 15448-59-6 Menadione epoxide Menadione-2,3-epoxide NSC65669 Naphth[2,3-b]oxirene-2,7-dione, 1a,7a-dihydro-1a-methyl-