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

2-acetyl-10,11-diacetoxy-3,4-(isopropylidenedioxy)-12-(3'-acetoxy-2',2'-dimethylpropan-1'-yloxy)-3(S*),4(R*),4a(S*),5-tetrahydronaphthacene

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

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