“…The 13 C-NMR data (Table 2) revealed the presence of 25 carbons assignable by HSQC and HMBC, including five methyl groups, two methylene groups, thirteen methine groups, and five quaternary carbons. 1 H-NMR (Table 2) and 1 H-1 H COSY spectra (see supplemental data) showed an isolated vinylic doublebond spin system at δ H 5.80 (dd, J = 17.6, 10.9, 1H), 5.29 (d, J = 17.6, 1H) and 5.04 (d, J = 10.9, 1H) ppm, as well as a sequentially traceable H-5, H-6, H-7, H-8, and H-9 partial ring spin system with an attached an isopropyl group at the C-7 position (Table 2, Figure 2). Furthermore, 1 H-NMR chemical shifts of H-6 and H-8 (i. e., 5.18 and 5.40 ppm, respectively) suggested the presence of acyl groups at the C-6 and C-8 positions.…”