“…[ppm] = 8 16. 8.12 (m, 1H, H-4), 7.56-7.47 (m, 2H, H-1, H-3), 7.25-7.17 (m, 10H, H-15, H-16, H-17), 7.16-7.07 (m, 1H, H-8), 7.00-6.94 (m, 1H, H-6), 4.19-4.15 (m, 2H, H-18), 1.99-1.94 (m, 2H, H-19), 1.63-1.57 (m, 2H, H-20), 1.46-1.29 (m, 8H, H-21, H-22, H-23, H-24), 0.89 (t, 3 JHH = 6.5 Hz, 1H, H-25).…”