10-(tert-butyldimethylsiloxy)-8,9-(di-tert-butylsilylenedioxy)-1-oxo-1,4,4a(S*),9(R*),9a(R*),10(S*)-hexahydroanthracene

1-acetoxy-10-(tert-butyldimethylsiloxy)-8,9-(di-tert-butylsilylenedioxy)-1(R*),4,4a(S*),9(R*),9a(S*),10(S*)-hexahydroanthracene

6-(tert-butyldimethylsiloxy)-10,11-(di-tert-butylsilylenedioxy)-12,12-(2',2'-dimethylpropane-1',3'-diyldioxy)-2-oxo-1,2,4a(R*),5,5a(S*),6(S*),11(R*),11a(R*),12,12a(S*)-decahydronaphthacene

2-acetyl-10,11-dihydroxy-6-(tert-butyldimethylsiloxy)-3,4-(isopropylidenedioxy)-12,12-(2',2'-dimethylpropane-1',3'-diyldioxy)-3(S*),4(R*),4a(S*),5,5a(S*),6(S*),11(R*),11a(R*),12,12a(S*)-decahydronaphthacene

rac-(7R,7aR,8aR,9S,10S,12aR,13aS,13bS)-2,2-di-tert-butyl-7-((tert-butyldimethylsilyl)oxy)-9,10-dihydroxy-5',5'-dimethyl-7,7a,8,8a,9,10,12,12a,13a,13b-decahydro-11H-spiro[tetraceno[1,12-de][1,3,2]dioxasiline-13,2'-[1,3]dioxan]-11-one