6-chloro-4-iodo-2-(ethoxymethoxy)-3-hydroxymethylpyridine

(S)-1-ethyl-3,4-dioxo-1,3,4,5-tetrahydro-furo[3,4-c]pyridine-1-carboxylic acid diethylamide

(S)-5-diethylcarbamoyl-5-ethyl-4-methyl-2-oxo-2,5-dihydro-furan-3-carboxylic acid ethyl ester