69648-38-0 Bay q 4218 Butaprost Butaprost [USAN:BAN:INN] Butaprostum [Latin] Cyclopentaneheptanoic acid, 3-hydroxy-2-(4-hydroxy-4-(1-propylcyclobutyl)-1-butenyl)-5-oxo-, methyl ester, (1R-(1alpha,2beta(1E,4R*),3alpha))- Methyl (13E,16R)-11alpha,16-dihydroxy-9-oxo-17,17-trimethyleneprost-13-en-1-oate Methyl (1R,2R,3R)-3-hydroxy-2-((1E,4R)-4-hydroxy-4-(1-propylcyclobutyl)-1-butenyl)-5-oxocyclopentaneheptanoate TR-4979