“…Its NMR data are as follows: 1 H-NMR (400 MHz, CDCl 3 ) δ: 6.38 (1H, d, J = 1.2 Hz, H-13a), 5.92 (1H, d, J = 1.2 Hz, H-13b), 4.82 (1H, d, J = 11.2 Hz, H-6), 4.63 (1H, dd, J = 1.2, 6.0 Hz, H-9), 4.59 (1H, d, J = 6.0 Hz, H-8), 3.45 (1H, dd, J = 1.6, 11.2 Hz, H-7), 3.03 (1H, m, H-4), 1.12 (3H, s, H-14), 1.01 (3H, d, J = 6.8 Hz, H-15), 13 C NMR (100 MHz, CDCl3) δ: 25.1 (C-1), 33.0 (C-2), 35.4 (C-3), 73.2 (C-4), 77.2 (C-5), 71.0 (C-6), 45.2 (C-7), 78.2 (C-8), 211.1 (C-9), 41.7 (C-10), 132.6 (C-11), 168.4 (C-12), 126.7 (C-13), 20.3 (C-14), 22.0 (C-15), 2 iBu (176.8, 175.1, 33.80, 33.77, 18.9, 18.8, 18.7). It was identified as incaspitolide A by comparison of the physical and spectral data with the literature [ 22 ]. Its purity was 98.65% by HPLC analysis.…”