13,14-Dihydro-15-keto-PGE1 13,14-Dihydro-15-ketoprostaglandin E1 15-Keto-13,14-dihydro-PGE1 19338-40-0 31172-22-2 5094-14-4 Prostan-1-oic acid, 11-hydroxy-9,15-dioxo-, (11alpha)-