Prostaglandin I2 is an unstable prostaglandin compound that inhibits platelet aggregation and induces vasodilation in the pulmonary vasculature via the "I prostanoid" (IP) receptor. AFP 07, a 7,7-difluoroprostacyclin derivative, serves as a selective and potent agonist for the IP receptor (Ki=0.561 nM). It exhibits weaker affinity for EP receptors, with a Ki value of > 100 nM for EP1-3 and > 10 nM for EP4. The compound 16(R)-AFP 07 free acid is an enantiomer of AFP 07. Its biological properties, particularly those involving IP and EP receptors, are yet to be fully assessed.