“…4a,6a-Dihydroxyeudesman-8,1 2-olide was acetylated with Ac20/pyridine at room temperature. The reaction product was purified by recrystallization (MeOH) and identified as 6aacetoxy-4a-hydroxyeudesman-8J3,12-olide (1 a) by its 1H-NMR spectrum (6). 1H,s,5.27 (1H,dd,J= 11.6,2.0Hz,, 4.51 (IH, ddd,J = 6.4,5.6,1.6Hz, H-8), 2.97 (1H, dd,J = 5.6, 9.6 Hz, H-7), 2.08 (1H, d,J = 15.4,1.6Hz, H-9), 1.13 (3H, s, H-15), 1.01 (3H, s, H-14), 2.05 (3H, s, H-17), 13CNMR see Table 2.…”