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

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

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

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