Micová, J: Some amino sugars structurally related to 6-deoxymannojirimycin precursors prepared from methyl 6-deoxy-2,3-O-isopropylidene-alpha-D-lyxo-hexofuranosid-5-ulose and methyl|2,3-0-isopropylidene-alpha-D-lyxo- pentodialdo-1,4-furanoside