“…In the 13 C NMR spectra the signals for C-2 appeared upfield shifted with respect to the same resonances for the glycosides 14e19, as corresponds to the substitution of an oxygen atom by a sulfur atom. 35 The b configuration of compound 27 was deduced from the J 2,3 value (5. 8 Hz), similar to that for 17e19.…”