31753-17-0 5-HEPTENOIC ACID, 7-(3-HYDROXY-2-(3-HYDROXY-1-OCTENYL)-5-OXOCYCLOPENTYL)-, METHY 5-Heptenoic acid, 7-(3-hydroxy-2-(3-hydroxy-1-octenyl)-5-oxocyclopentyl)-, methyl ester, stereoisomer BRN 2951095 PGE2 methyl ester Prostaglandin E2 methyl ester