The invention relates to novel chemical entities that act as thromboxane (TX) A2 receptor, or T prostanoid receptor (TP), antagonists and to their use in the treatment of human diseases in which thromboxane (TX) A and of all other agents that act as incidental ligands of TP, including the endoperoxide prostaglandin (PG)G2/PGH2, 20-hydroxyeicosatetraenoic acid (20-HETE) and the free-radical derived isoprostanes (e.g., 8-iso-prostaglandin (PG)F2α), play a role. Compounds of the invention preferably include a benzenesulfonyl urea in which the benzene is substituted by a substituted biphenylyloxy group (e.g., at the 2 position) and by a nitrile group (e.g., at the 5 position), which compounds show promising results as TP-isoform selective TP antagonists.