“…Moreover, proton signals ascribed to methylene groups at δ H 1.95 (1H, ddd, J = 13.3, 4.4, 2.8 Hz, H-3a), 1.90 (1H, ddd, J = 12.5, 4.4, 2.9 Hz, H-5a), 1.70 (2H, m, H-6) and overlapping peaks at δ H 1.23 (2H, m, H-3b and H-5b) along with carbon shifts at δ C 43.7 (C-3), 29.1 (C-6) and 34.3 (C-5) were observed (Table 1). The 1,2,4-trihydroxysubstituted cyclohexane ring were established by 1 H-1 H COSY correlations between H-3/H-4, H-1/H-6, H-5/H-6 and H-4/H-5 as well as, HMBC correlations of H-4 (δ H 3.84) to C-6 and C-2, H-1 (δ H 3.36) to C-1 ′ (δ C 40.7) and C-5. The location of ∆ 10 ′ ,11 ′ double bond was deduced from the HMBC correlation of terminal methyl proton H-15 ′ (δ H 0.92) to C-13 ′ (δ C 33.1), overlapping vinylic protons H-10 ′ /H-11 ′ to C-8 ′ (δ C 30.3) and to C-13 ′ , and protons H-9 ′ /H-12 ′ (δ H 2.04) to C-7 ′ (δ C 30.6) and C-14 ′ (δ C 23.4), respectively.…”