1,4-dihydro-5,12-dihydroxynaphthacene-6,11-dione
6,11-Dihydroxy-1,4,4a,12a-tetrahydro-naphthacene-5,12-dione
6,11-Dihydroxy-1,2,3,4,4a,12a-hexahydro-naphthacene-5,12-dione
1,4-dihydro-5,12-dimethoxynaphthacene-6,11-dione
1,2,3,4-tetrahydro-2,5,12-trihydroxynaphthacene-6,11-dione