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The stereoselective exo-face thiol attack addition at C-4 position with formation of 1,6-anhydro-deoxy-4-S-(5-amino-1,3,4-thiadiazol-2-yl)-d-glycero-hexopyranos-2-ulose (23) and 1,6-anhydro-3-deoxy-4-S-(4,5-dihydrothiazol-2-yl-d-glycero-hexopyranos-2-ulose) (26).
