This invention relates to compounds of the general formula (I) ##STR1## and physiologically acceptable salts and hydrates thereof, in which R.sub.1 represents a hydrogen atom or an alkyl, alkanoyl, aroyl or trifluoroalkyl group; R.sub.2 represents a hydrogen atom or an alkyl or alkenyl group or C.sub.2-6 alkyl group substituted by a hydroxy or alkoxy group; X represents a sulphur atom or NH; Y represents an oxygen or sulphur atom or a bond; m represents 1, 2 or 3; and n represents 2, 3 or 4. The compounds show pharmacological activity as selective histamine H.sub.2 -antagonists.
本发明涉及通式(I)的化合物及其生理上可接受的盐和
水合物,其中R1代表氢原子或烷基,烷酰基,芳酰基或三
氟甲基基团; R2代表氢原子或烷基或烯基基团或C2-6烷基基团,其被羟基或烷氧基取代; X代表
硫原子或NH; Y代表氧原子或
硫原子或键; m代表1,2或3; n代表2,3或4。这些化合物作为选择性
组胺H2-拮抗剂表现出药理活性。