1. The HMBC correlations of 5-OMe (dH 3.03) and H-6
(dH 5.80) with C-5 (dC 81.0), of H-8 (dH 2.98) and H-19 (dH 9.44) with
C-9 (dC 47.6), of H-8 (dH 2.98), H-10 (dH 2.40) and H-11 (dH 1.44)
with C-19 (dC 200.3) confirmed that the methoxyl and aldehyde
groups were located at C-5 and C-19, respectively (Fig. 2).