7-[(2R,4aR,5R,7aR)-2-(1,1-difluoropentyl)-2-hydroxy-6-oxo-3,4,4a,5,7,7a-hexahydrocyclopenta[e]pyran-5-yl]heptanoic acid 7-[(2R,4aR,5R,7aR)-2-(1,1-difluoropentyl)-2-hydroxy-6-keto-3,4,4a,5,7,7a-hexahydrocyclopenta[e]pyran-5-yl]enanthic acid (-)-7-((2R,4aR,5R,7aR)-2-(1,1-Difluoropentyl)-2-hydroxy-6-oxooctahydrocyclopenta (b)pyran-5-yl)heptanoic acid SPI-0211 Lubiprostone [USAN] Prostan-1-oic acid, 16,16-difluoro-11-hydroxy-9,15-dioxo-, (11alpha)- Amitiza