(R)-4-Hydroxy-6-((R)-2-hydroxy-propyl)-tetrahydro-pyran-2-one

{(8S,10R)-10-[(R)-2-(tert-Butyl-diphenyl-silanyloxy)-propyl]-8-hydroxy-9-oxa-1,5-dithia-spiro[5.5]undec-8-yl}-acetic acid tert-butyl ester

(R)-10-((R)-2-Hydroxy-propyl)-9-oxa-1,5-dithia-spiro[5.5]undecan-8-one

(S)-10-((2S,4S)-2,4-Dihydroxy-pentyl)-9-oxa-1,5-dithia-spiro[5.5]undecan-8-one