88851-62-1 Cyclopenta(b)pyrrole-2-pentanoic acid, 1,4,5,6-tetrahydro-5-hydroxy-4-(3-hydroxy-1-octenyl)-1-phenyl-, monopotassium salt, (4R-(4alpha(1E,3S*),5beta))- PIRIPROST POTASSIUM Piriprost potassium [USAN] Potassium (4R,5R)-1,4,5,6-tetrahydro-5-hydroxy-4-((E)-(3S)-3-hydroxy-1-octenyl)-1-phenylcyclopenta(b)pyrrole-2-valerate U-60,257B