Gv. Malinovskaya et al., The chemistry of naphthazarine derivatives 5. The structure of dehydroechinochrome monohydrate, RUSS CHEM B, 48(8), 1999, pp. 1587-1589
Based on IR and H-1 and C-13 NMR spectroscopic studies, the oxidation produ
ct of echinochrome with Ag2O was assigned the structure of 2,3-epoxy-7-ethy
l-2,3-dihydro-2,3,5,6,8-pentahydroxy-1,4-naphthoquinone.