5,6,11,12-tetramethoxy-1,2,3,4-tetrahydrotetracen-2-ol

2-chloro-5,8-dimethoxy-1,4-dihydro-naphthalene

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

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