Synonyms: Cyclopentaneheptanoicacid, 3-hydroxy-2-[(1E,4R)-4-hydroxy-4-(1-propylcyclobutyl)-1-butenyl]-5-oxo-,methyl ester, (1R,2R,3R)- (9CI); Cyclopentaneheptanoic acid,3-hydroxy-2-[4-hydroxy-4-(1-propylcyclobutyl)-1-butenyl]-5-oxo-, methyl ester,[1R-[1a,2b(1E,4R*),3a]]-; BAY-q 4218; Butaprost; TR 4979