ompounds1–6were determined the absolute configuration of
the carbinol centres by the analysis of the 1 H NMR data of the (S)-Mosher (1r–6r) and (R)-Mosher (1s–6s) ester derivatives (Table 4). 11Rand 20Sconfiguration was assigned for1–3, and 13Rand 22S
for4,whereas 13S,16R,21Sconfiguration was assigned for5–6