((3aR,5S,6R,6aR)-2,2,6-trimethyl-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl)methyl 4-methylbenzenesulfonate (13)
(+)-prelactone B
(2S,3R,4S,5R)-5-isopropyl-4-methyl-tetrahydrofuran-2,3-diol
6-O-tert-butyldimphenylsilyl-3-deoxy-5-O-methoxymethyl-3-C-methylene-1,2-O-isopropylidene-α-D-ribo-hexofuranose