4-Benzoxazolyl-4'-oxadiazolyl stilbene optical brighteners

4-Halo-5-formyl thiazoles

4-methyl-5-(2-(4-phenylpiperazin-1-yl)ethyl)thiazole derivatives

4-Oxo-PGI.sub.1 compounds

4-Pyrone prostaglandin antagonists

4-Stilbenyl-1,2,3-triazoles, process for preparing them and thei

5,6-Alkylenepyrimidine derivative

5-(6-Alkylindol-3-ylmethylene)-1,3-dimethyl-2-(methylimino)- 4-i

5-(Indol-3-ylmethylene)-1,3-dimethyl-2-methylamino-4-imidazolidi

5-Amino-2-hydrazinopyridine and derivatives thereof

5-Benzyl pyrimidines intermediates therefore, and method

5-Halo PGI compounds

5-Hydroxy-PGI.sub.1 compounds

5-Hydroxy-PGI.sub.1 compounds

5-Hydroxy-PGI.sub.1 hexamethyliminoamides

5-Hydroxy-PGI.sub.1 morpholinylamides

5-Hydroxy-PGI.sub.1 piperazinylamides

5-Hydroxy-PGI.sub.1 piperidylamides

5-Hydroxy-PGI.sub.1 pyrrolidylamides

5-Hydroxy-PGI.sub.1 pyrrolinylamides