8β,12α-PGF2β 15-ethers
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation application of Ser. No. 518,694, filed Oct. 29, 1974, now abandoned; which is a divisional application of Ser. No. 374,405, filed June 28, 1973, now pending issuance as a United States Patent; which is a continuation-in-part of Ser. No. 289,317, filed Sept. 15, 1972, now abandoned. 
    
    
     The present invention relates to prostaglandin analogs, for which the essential material constituting disclosure therefor is incorporated by reference here from U.S. Ser. No. 518,436, filed Oct. 29, 1974, issued as U.S. Pat. No. 3,969,396 on July 13, 1976; which application is a divisional application of Ser. No. 374,405.