Prostanoic acid derivatives having luteolytic activity are provided. A representative compound is 16-(6-chloropyrid-2-yloxy)-9.alpha., 11.alpha., 15-trihydroxy-17, 18, 19, 20-tetranor-5-cis, 13-trans-prostadienoic acid.
                            提供具有黄体破坏活性的前列酸衍
生物。代表性化合物是16-(6-
氯吡啶-2-氧基)-9.alpha.,11.alpha.,15-三羟基-17, 18, 19, 20-四烯-5-顺,13-反-前列二烯酸。