SEARCH Articles Figures Tables A-D-Altropyranoside, methyl Altropyranoside Altropyranoside methyl 2-thio Altropyranoside methyl 3,4-anhydro Altropyranoside methyl 3-amino-, 3-deoxy Altropyranoside methyl 3-amino-3-deoxy-2-thio Altropyranosides