“…Its 1 H NMR spectrum indicated the presence of an asymmetrical stilbene core (δ 6.87 ppm, 1H, d, J = 16 Hz, H-1′; δ 6.77 ppm, 1H, d, J = 16. 5 Hz, H-2′) with both an AA′ benzene ring system (δ 6.46 ppm, 2H, s, H-4′ and -8′) and an AB benzene ring system (δ 6.91 ppm, 1H, d, H-6; δ 6.84 ppm, 1H, d, H-8). Proton signals at δ 5.23 (1H, tq, J = 7, 1.5 Hz, H-2″), 3.27 (H-1″, partially obscured by solvent), 1.76 (3H, s, H-4″), and 1.65 ppm (3H, s, H-5″) indicated the presence of an isoprenyl group.…”