17-Phenyl-18,19,20-trinor-cis-4,5-didehydro-PGF.sub.1.beta. compounds

An optically active compound of the formula:

• ##STR1## or a racemic form of that compound and the enantiomer thereof, WHEREIN R.sub.1 is hydrogen or alkyl of one to 12 carbon atoms, inclusive, cycloalkyl of 3 to 10 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, phenyl, or phenyl substituted with one, 2, or 3 chloro or alkyl of one to 4 carbon atoms, inclusive;
• Wherein M is ##STR2## or ##STR3## wherein R.sub.2 is hydrogen, methyl, or ethyl;
• WHEREIN E is trans--CH=CH-- or --CH.sub.2 CH.sub.2 --;
• wherein R.sub.8 is hydrogen and R.sub.9 is hydrogen, methyl, or fluoro, or wherein R.sub.8 and R.sub.9 are both methyl or both fluoro, with the proviso that neither of R.sub.8 and R.sub.9 is methyl when R.sub.2 is methyl or ethyl;
• Wherein C.sub.t H.sub.2t represents a valence bond or alkylene of one to 9 carbon atoms, inclusive, with one to 6 carbon atoms, inclusive, between --CR.sub.8 R.sub.9 -- and the ring;
• and
• Wherein T is alkyl of one to 4 carbon atoms, inclusive, fluoro, chloro, trifluoromethyl, or --OR.sub.3, wherein R.sub.3 is alkyl of one to 4 carbon atoms, inclusive and wherein s is zero, one, 2, or 3 with the proviso that not more than 2 T's are other than alkyl;
• including alkanoates of 2 to 8 carbon atoms, inclusive, and pharmacologically acceptable salts thereof when R.sub.1 is hydrogen.