(2R,3S,6S,8S,10S)-(+)-10-diphenyl-t-butylsilyloxy-2,3-dimethyl-8-(p-tolylsulphonyloxy)methyl-1,7-dioxaspiro<5.5>undecane

(2R,3S,6S,8S,10R)-(E)-10-diphenyl-t-butylsiloxy-2,3-dimethyl-8-(4'-iodo-3'-methylbut-2'enyl)-1,7-dioxaspiro<5.5>undecane

(2'R,3'S,6'S,8'R,10'R)-(E)-(+)-4-(10'diphenyl-t-butylsiloxy-2',3'-dimethyl-1',7'-dioxaspiro<5.5>undecan-8'-yl)-2-methylbut-2-enol

2-(5-benzyloxy-4-methyl-hex-2-ynoyl)-1,8-diisopropoxy-3-methyl-anthraquinone

2-(5-benzyloxy-1-hydroxy-4-methyl-hex-2-ynyl)-1,8-diisopropoxy-3-methyl-anthraquinone