L-798106 is a potent and selective prostanoid receptor EP3-selective antagonists. L-798106 has been used in multiple studies to tease out EP3 agonist activity, both in vitro and in vivo. L-798106 successfully blocks the actions of sulprostone, an EP3-selective agonist. L-798106 was useful in showing that the vascular contraction effect of PGE2 is due to its prostanoid EP3 agonist activity.