Terrett et al., Sildenafil (Viagra) a potent and selective, etc., Bioorganic and Medic. Chemistry Ltr. 6, 15, 1819-1824, 1996. |
Truss et al., Phosphodiesterase Inhibitors, etc., Drugs of Today, 34, 805-812, 1998. |
Polymeropoulos et al., Peptide binding site model for :PDE 4 inhibitors, 18 Quant. Struct. -Act. Relat. (1999) 543-547. |
Dent et al., Effects of a selective PDE4 inhibitor D-22888 on human airways, etc., 11 Pulm. Pharmacol. Ther. (1998). |
Davey et al., Novel compounds possessing potent cAMP and cGMP phosphodiesterase inhibitory activity, etc., 34 J. Med. Chem., 1991, 2671-2677. |