2-(tert-butyldimethylsiloxymethyl)-4-hydroxymethyl-1,3,3-trimethyl-cyclohexa-1,4-diene

(4S)-2-(tert-butyldimethylsiloxymethyl)-4-hydroxy-4-(hydroxymethyl)-1,3,3-trimethyl-cyclohex-1-ene

(5S)-7-(tert-butyldimethylsiloxymethyl)-1,3-dioxa-2-oxo-6,6,8-trimethyl-spiro[4,5]dec-7-ene

(5S)-7-(tert-butyldimethylsiloxymethyl)-1,3-dioxa-2-oxo-9-hydroxy-6,6,8-trimethyl-spiro[4,5]dec-7-ene