... Please enable JavaScript to use all the features on this page. European Journal of Medicinal Chemistry. ... 4g, 4.57 (2H, s), 7.05–7.25 (4H, m), 7.25–7.35 (1H, m), 7.40–7.50 (2H, m), 7.51 (1H, td overlapped, J 1 =1.6 Hz, J 2 =7.7 Hz), 3448 (NH), 3134–2638 (H-bridges). ...