Furthermore, the proton signal due to the benzylic H-11 on the geranyl part showed cross-peaks with the C-6 (C$c149.9), C-7 (~c 125.2) and C-8 (¢5c 132.9) signals, amongst which the C-7 and C-8 shared HMBC correlations with the H-21, thereby confirming the geranyl group at the C-7 position.