The invention relates to compounds of the general formula (I) ##STR1## and physiologically acceptable salts, hydrates and bioprecursors thereof, which show pharmacological activity as selective histamine H.sub.2 -antagonists.
本发明涉及通式(I)的化合物及其生理学上可接受的盐,
水合物和
生物前体,这些化合物具有作为选择性
组胺H.sub.2-拮抗剂的药理活性。