2,5,6,7-tetranor-18,18,19,19-tetradehydro-4,8-inter-m-phenylene PGI.sub.2 derivatives

摘要

Disclosed herein are novel prostaglandin I.sub.2 (PGI.sub.2) derivatives exhibiting excellent physiological activities, said derivatives being represented by the general formula: ##STR1## wherein R. sub.1, R.sub.2 and R.sub.3 are as defined herein.