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

5,6-dihydro(1H-indolo(3,2-C)quinoline-6,4'-piperidines) and rela

5,6-dihydro-(1,4,2)-Dioxazin-substituted (hetero)...

5,6-Dihydro-1,2,4,6-thiatriazin-5-one-1,1-dioxides

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

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

5,6-Dihydro-11-methylenemorphanthridin-6-ones, their preparation

5,6-dihydro-2-(substituted phenyl)-1,2,4-triazine-3,5(2H,4H)-dio

5,6-Dihydro-2-(substituted phenyl)-1,2,4-triazine-3,5,(2H,4H)-di

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-dihydro-4H-1,3-oxa(or thia)zine derivatives, their preparati

5,6-Dihydro-4H-1,3-thiazine-2-carboxaldehyde oxime useful as ins

5,6-Dihydro-4H-cyclopenta(b)thiophene-6-carboxylic acids, prepar

5,6-dihydro-4h-imidazo 2',1':2,3!imidazo- 4,5,1-ij!quinoline and

5,6-dihydro-4H-imidazo[4,5,1-ij]quinolines

5,6-dihydro-4H-imidazo[4,5,1-IJ]quinolines

5,6-Dihydro-5-oxo-1,4-dithiino (2,3-d) pyridazine-2,3-dicarbonit

5,6-dihydro-6H-dibenz[c,e]azepine-6-(thio)carboximidic acid este