17-phenyltrinorProstaglandinF2α N-ethyl amide (17-phenyltrinor PGF2α) is an F-series prostaglandin analog which has been approved for use as an ocular hypotensive drug, sold under the Allergan trade name 17-phenyltrinor PGF2α ethyl amide. Investigations in our lab have shown that 17-phenyltrinor PGF2α ethyl amide is converted by an amidase enzymatic activity in the human cornea to yield the corresponding free acid, with a conversion rate of about 25 μg cornea 24 hours. The free acid, 17-phenyltrinor PGF2α, is a potent FP receptor agonist. 15(R)-17-phenyltrinor PGF2α is the 15-epi, or unnatural isomer of this active free acid metabolite. It has much diminished FP receptor-mediated activity