5,6-Didehydro-.omega.-phenoxy-PGE.sub.2.alpha. analogs

5,6-Dihydro analogues of prostaglandin I.sub.2

5,6-Dihydro-11-alkylene-morphanthridin-6-ones

5,6-Dihydro-4-oxo-4H-thieno[2,3-b]thiopyran-5-carboxamides, and

5,6-Dihydro-4-oxo-4H-thieno[2,3-b]thiopyran-5-carboxamides, and

5,6-Dihydro-4-oxo-4H-thieno[2,3-b]thiopyran-5-carboxamides, and

5,6-Dihydroxy aminotetralol compounds

5,6;8,9-Tetrahydro-7H-dibenz(d,f)azonines

5,8-Dihydro-5-oxo-2-(4-or 3-pyridinyl)pyrido[2,3-d]pyrimidine-6-

5,8-Dihydroxy-1,4-bis(guanidinylamino)anthraquinones

5,8-Dihydroxy-1,4-bis(guanidinylamino)anthraquinones

5- OR 6-Acetyl-substituted 1-methyl-4-isopropyl-1,4-ethano-cyclo

5- Or 6-pyridazinyl-benzimidazoles and salts thereof

5-(1,1-Diphenyl-3-(4-phenylpiperidino)propyl)-2-methyl-1,3,4-oxa

5-(1,1-Diphenyl-3-(5- or 6-hydroxy-2-azabicyclo(2.2.2)oct-2-yl)p

5-(1,1-Diphenyl-4-(cyclic amino) but-2-trans-en-1-yl)-2-alkyl-1,

5-(1,2,3,4-Tetrahydro-6-methoxy-2-naphthyl )-2-hydroxy-1-methylc

5-(2,5-Dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarbox

5-(2-Aminophenyl)-s-triazoles

5-(2-Carboxythiophen-5-y l)-16-aryloxy-.alpha.-tetranor-.omega.-