Identification of 2,3-diaryl-pyrazolo[1,5-b]pyridazines as potent and selective cyclooxygenase-2 inhibitors. by Beswick, P, Bingham, S, Bountra, C, Brown, T, Browning, K, Campbell, I, Chessell, I, Clayton, N, Collins, S, Corfield, J, Guntrip, S, Haslam, C, Lambeth, P, Lucas, F, Mathews, N, Murkit, G, Naylor, A, Pegg, N, Pickup, E, Player, H, Price, H, Stevens, A, Stratton, S, Wiseman, J