“…Operculinic acid H (1): white solid, mp 158−160 °C; ORD (c 0.02, MeOH) [α] 22 589 −35.0, [α] 578 −50.0, [α] 546 −50.2 [α] 436 −60.0; 1 H NMR (800 MHz, C 5 D 5 N) and 13 C NMR (200 MHz, C 5 D 5 N) data, see Tables 1 and 2 −20.0, [α] 578 −21.4, [α] 546 −24.3, [α] 436 −37.1; 1 H NMR (700 MHz, C 5 D 5 N) δ 4.79 (1H, d, J = 7.4 Hz, Qui-1), 4. 19 (1H,dd,J = 8.7,8.7 Hz,3.96 (1H,dd,J = 8.7,7.4 Hz,3.87 (1H,1H,m,3.77 (1H,dq,J = 8.7,6.3 Hz,3.71 (1H,dd,J = 8.7,8.7 Hz,, 2.54 (2H, m, CH 2 Agl-2), 1.62 (3H, d, J = 6.3 Hz), 0.93 (3H, t, J = 7.1 Hz, Agl-10); 13 C NMR (175 MHz, C 5 D 5 N) 175.7 (Agl-1), 103.8 (Qui-1), 79.1 (Agl-7), 78.2 (Qui-3), 77.2 (Qui-4), 75.8 (Qui-2), 73.1 (Qui-5), 38.1 (Agl-8), 37.3 (Agl-2), 35.0 (Agl-6), 30.4 (Agl-4), 26.7 (Agl-3), 25.2 (Agl-5), ; HRESIMS m/z 357.18801 [M + Na] + (calcd for C 16 H 30 O 7 Na requires 357.188 37, δ = −1.0 ppm).…”