4-Amino-2-ureido (or -thioureido)-pyrimidine-5-carboxylic acid a

4-Amino-3-p-halophenylbutyric acids and their derivatives used i

4-Amino-3-quinolinecarboxylic acids and esters-antisecretory ant

4-Amino-6, 7-dimethoxy-2-(4-heteroaryl-piperazino) quinazoline _

4-Amino-6,7-dimethoxy-2-(4-heteroaryl-piperazino)quinazoline ant

4-Amino-6,7-dimethoxy-2-(4-heteroaryl-piperazino)quinazoline ant

4-Amino-6,7-dimethoxy-2-piperazinylquinazoline derivatives, thei

4-Amino-6,7-dimethoxyquinazol-2-yl alkylenediamines

4-Amino-6-(pyridinyl)-3(2H)-pyridazinones and their use as cardi

4-Aminopyridines and medicaments containing the same

4-Aminoquinazoline cardiac stimulants

4-Aminoquinazoline derivatives having fungicidal, anti-insect an

4-Aminoquinoline derivatives, useful as anti-inflammatory agents

4-Androsten-3-ones and process for the preparation thereof

4-Anilinoquinazoline compounds and pharmaceutical compositions t

4-Aryl-4-aryloxypiperidines

4-Aryl-5-piperazinoalkyl-1,3-dioxol-2-ones, and compositions

4-Aryloxy-1,2,3,4-tetrahydroisoquinolines

4-Aza-17.beta.-substituted-5.alpha.-androstan-3-one-reductase in

4-Carbethoxy-carbonilamino-pyrimidines and a process for their p