“…7,9,12 a All these assignments were in agreement with HSQC, HMBC and NOESY spectra. b In this compound, the decalin part possesses a boat conformation for both A and B rings ( 3,10 B and 7,10 B, respectively) and consequently, the H-1˛, H-2˛, H-3ˇ, H-6˛, H-7ˇand H-10ˇprotons are axially oriented, whereas the H-1ˇ, H-3˛, H-7˛and H-8ˇhydrogens are equatorial substituents.…”