6,11-dihydroxy-1,4,4a,12a-tetrahydrotetracene-5,12-dione

1,4,4a,12a-tetrahydrotetracene-5,6,11,12-tetrone

5,6,11,12-tetramethoxy-1,4-dihydrotetracene

8-hydroxy-6,11-dimethoxy-7,8,9,10-tetrahydrotetracene-5,12-dione

6,11-dimethoxy-7,10-dihydrotetracene-5,12-dione