Prostaglandin analogs possessing antinidatory effects. 2. Modification of the .alpha. chain

Abstract
Additional double bonds were introduced into the .alpha. chain in 16-phenoxy-, 16-(3-chlorophenoxy)-, 16-[3-(trifluoromethyl)phenoxy]- and 16-(4-chlorophenoxy)-17,18,19,20-tetranorprostaglandins which have antinidatory effects. Of these analogs, the .DELTA.3-cis-.DELTA.5 analog 16-phenoxy-17,18,19,20-tetranor-3,4-trans,cis-didehydroprostaglandin F2.alpha. methyl ester is 1200 times more potent than prostaglandin F2.alpha. in antinidatory effect in the rat and more potent than any other known prostaglandin analogs.

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