The HMBC correlations of OMe-19 (dH 3.32) with C-
19 (dC 105.1), of H-19 (dH 4.82) with C-9 (dC 45.8), C-10 (dC 39.6) and
C-11 (dC 22.6), of H-8 (dH 2.51) with C-7 (dC 72.0) and C-19 (dC 44.3)
and of H-10 (dH 2.53) with C-5 (dC 147.9) and C-6 (dC 125.4) further
confirmed the positions of the methoxyl group and the epoxy
bridge (Fig. 2)