Synonyms: Cyclopentaneoctanoicacid, 2-(2-carboxyethyl)-5-hydroxy-e,3-dioxo-, [1R-(1a,2b,5b)]-; Cyclopentaneoctanoic acid,2-(2-carboxyethyl)-5-hydroxy-e,3-dioxo-, stereoisomer (8CI); (-)-7a-Hydroxy-5,11-diketotetranorprostan-1,16-dioic acid;(-)-PGE2UM; 7-Hydroxy-5,11-diketotetranorprosta-1,16-dioic acid; 7a-Hydroxy-5,11-diketotetranorprosta-1,16-dioicacid; 7a-Hydroxy-5,11-diketotetranorprostane-1,16-dioicacid; PGE-M; PGE2UM