75324-03-7 Naphthaceno(2,3-b)oxirene-2-carboxylic acid, 1a-ethyl-1a,2,4,9,11,11a-hexahydro-3,8,10-trihydroxy-4,9-dioxo-, methyl ester, (1aS-(1aalpha,2alpha,11aalpha))-