1-(10,10-dimethyl-3,3-dioxo-3λ6-thia-4-aza-tricyclo[5.2.1.01,5]dec-4-yl)-oct-6-yne-1-one

1-(10,10-dimethyl-3,3-dioxo-3λ6-thia-4-aza-tricyclo[5.2.1.01,5]dec-4-yl)-2-methyl-oct-6-yne-1-one

(3S,6R,7S,8S)-3,7-bis-(tert-butyldimethylsilanyloxy)-1-hydroxy-4,4,6,8-tetramethyl-tetradec-12-yne-5-one

(3S,6R,7S,8S)-3,7-bis-(tert-butyldimethylsilanyloxy)-4,4,6,8-tetramethyl-5-oxo-tetradec-12-ynoic acid

(3S,6R,7S,8S)-1,3,7-tris-(tert-butyldimethylsilanyloxy)-4,4,6,8-tetramethyltetradec-12-yne-5-one