... different role from PGH2, and prompted us to synthesize the following stable PGrHl analogs“: 9a,11oc-epoxymethano—15a—hydroxy—prost—13E—enoic acid (I),9) 11a,9a—epoxymethano— 15'oc 1) Part XIX: K. Inoue, S. Amemiya, Y. Tajima, and K. Sakai, Chem. ...