7-(2-hydroxyethyl)-3-fluoro-4,5-dihydro-7H-thieno[2,3-c]pyran-2-carboxamide

7-(2-tert-butyldimethylsilanyloxyethyl)-4,5-dihydro-7H-thieno[2,3-c]pyran-2-carboxylic acid

7-[2-(tert-butyldimethylsilanyloxy)ethyl]-3-fluoro-4,5-dihydro-7H-thieno[2,3-c]pyran-2-carboxylic acid

7-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-fluoro-4,7-dihydro-5H-thieno[2,3-c]pyran-2-carboxylic acid amide

7-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-chloro-4,7-dihydro-5H-thieno[2,3-c]pyran-2-carboxylic acid amide