title: Isolation of a new naturally occurring prostaglandin, 5-trans-PGA 2 . Synthesis of 5-trans-PGE 2  and 5-trans-PGF 2a .
mesh_terms: D002852:Chromatography, Ion Exchange; D003063:Cnidaria; D008722:Methods; D011453:Prostaglandins / Q000302:isolation & purification*
chemical_list: D011453:Prostaglandins