The gem-disubstituted double bond was placed on the side-chain based on the key H3- 26 and H3-27/C-24 as well as H2-241 /C-23 HMBC correlations. The spin system detected starting from H2-23 in the COSY spectrum was interrupted at H2-15.
The gem-disubstituteddouble bond was placed on the side-chain based on the key H3-26 and H3-27/C-24 as well as H2-241/C-23 HMBC correlations. Thespin system detected starting from H2-23 in the COSY spectrumwas interrupted at H2-15.