4,5-Dihydro-5-oxopyrazolo[1,5-a]quinazoline-3-carboxylic acid de

4,5-Dihydro-6-(4-pyridinyl)-3-pyridazinol and salts, their prepa

4,5-Dihydroimidazo-[1,2-a]quinoxaline-2-carboxylic acids and the

4,6-Diaryl-pyrimidin-2(1H)-ones as tranquilizers

4,7-Dihydro-4,7-dioxi-1H-cyclohepta[b]pyridine derivatives

4,9-Dihydro-4,9-dioxo-1H-cyclohepta[b]pyridine derivatives

4,9-Dihydro-9-oxo-N-1H-tetrazol-5-yl-pyrazolo[5,1-b]-quinazolin

4-(((Heterocyclo)thio)methyl)benzoic acids, esters and amides an

4-(2,1,3-Benzoxadiazol-4-yl)-1,4-dihydropyridazine derivatives,

4-(2-(1H-Imidazol-1-ylmethyl)-1,3-dioxol an-4-yl)methoxypyrazolo

4-(2-Pyridylamino)phenylacetic acid derivatives

4-(3,4-Diaminophenyl)pyridine or salts, and use thereof as cardi

4-(3-(4-Quinolyl)propyl)piperidines, their preparation and their

4-(Phenylalkyl)piperazine-1-carboxamides

4-(Substituted)-.alpha., .alpha.-dimethyl-1-piperazine pentanoic

4-Alkyl- and 4-allyl-mercapto-, -sulfinyl- and -sulfonyl-methyl-

4-Alkyl-2,6-di(secondary or tertiary alkylamino) pyridines, comp

4-Alkyl-2,6-di-(secondary or tertiary alkyl)amino-3-formylpyridi

4-Alkyl-pyrazolo[5,1-b]-quinazolin-9(4H)-ones and anti-allergic

4-Amino-2-piperidino-quinazolines