(2R,3S)-2,3-Dihydroxy-4-isopropoxy-gamma-butyrolactone Cyclohexyl Ketal

(3R,4S)-3,4-Dihydroxy-4-isopropoxydihydrofuran-2(3H)-one Cyclohexyl Ketal; (3'aR,6'aS)-Dihydro-6'-(1-methylethoxy)-spiro[cyclohexane-1,2'-furo[3,4-d][1,3]dioxol]-4'(3'aH)-one;