17-Phenyl-trinor-prostaglandin E2 is a synthetic analog of prostaglandin E2 (PGE2), that was found to be a selective EP1 and EP3 receptor agonist, unlike PGE2 which antagonizes a variety of EP receptors. 17-Phenyl-trinor-prostaglandin E2 has been shown to cause contraction of the guinea pig ileum at a concentration of 11 μM, and is slightly less potent than PGE2 in stimulating gerbil colon and rat uterus. 17-Phenyl-trinor-prostaglandin E2 has an ED50 value of 350 μg/kg, and is 4.4 times more potent than PGE2 as an antifertility agent in hamsters.