ethyl (5R,E)-5-(tert-butyldimethylsilyloxy)-8-trimethylsilyl-2-octen-7-ynoate

(1R,2R,5R,7R)-2-(trimethylsilyl)-7-(tert-butyldimethylsilyloxy)bicyclo[3.3.0]-octan-3-one

(2S,3R,4R,5S)-2-((1aR,3aR,5aS,10R,10aR)-10-Methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-5-methyl-7-trimethylsilanyl-hept-6-yne-3,4-diol

methyl 4-phenyl-6-(trimethylsilyl)-5-hexynoate

(5R,7R)-7-(tert-butyldimethylsilyloxy)-2-trimethylsilylbicyclo[3.3.0]oct-1-en-3-one