(S)-(-)-5-羟甲基-2(5H)-呋喃酮

(2S)-2-(trityloxymethyl)-2H-furan-5-one

(S)-(+)-γ-三苯甲基甲氧基-γ-丁内酯

2,5-anhydro-3-O-p-toluenesulfonyl-L-idose ethylene acetal

(3R,5S)-3-Hydroxy-5-trityloxymethyl-dihydro-furan-2-one