Disclosed herein are novel prostaglandin I.sub.2 (PGI.sub.2) derivatives exhibiting excellent in vivo duration and activities, said derivatives being represented by the general formula: ##STR1## wherein R.sub.1, X, R.sub.2 and R.sub.3 are as defined herein.
本文披露了一种展现出优异体内持续时间和活性的新型
前列腺素I.sub.2(
PGI.sub.2)衍
生物,所述衍
生物由以下一般式表示:##STR1##其中R.sub.1、X、R.sub.2和R.sub.3如本文所定义。