“…[𝛼] 𝐷 20 = -18.6 (c = 1.0, CHCl3). 1 H-NMR (400 MHz, CDCl3): δ = 0.85-0.94 (m, 12 H), 0.95-0.97 (m, 6 H), 1.13 (d,J = 7.0 Hz,3 H),10 H),1.38 (d,J = 7.3 Hz,3 H),1.42 (d,J = 7.2 Hz,3 H),1.46 (s,9 H),1 H),3 H),1 H),2.75 (quint,J = 7.3 Hz, 1 H), 3.79 (t, J = 5.0 Hz, 1 H), 4.02 (dd, J = 18.0, 4.9 Hz, 1 H), 4.20 (dd,J = 17.6,5.9 Hz,1 H),1 H),4.49 (quint,J = 7.5 Hz,1 H),4.60 (quint,J = 7.6 Hz,1 H),4.96 (d,J = 4.9 Hz, 1 H), 5.08 (dd, J = 8.8, 3.1 Hz, 1 H), 5.11-5.18 (m, 2 H), 6.43 (d, J = 6.4 Hz, 1 H), 6.86 (bs, 1 H), 7.02 (d,J = 8.0 Hz,1 H),7.11 (d,J = 7.2 Hz,1 H),5 H) ppm. 13 C-NMR (100 MHz, CDCl3): δ = 13.0, 14.…”