| 摘要 |
A guanidine derivative of the formula I: <IMAGE> I in which R1, R2, R3, R4, ring X and D are a variety of radicals defined in the specification and A is a 3-8C alkylene chain which is substituted by a hydroxy radical and into which is optionally inserted, as part of the backbone of the chain, one or two groups selected from oxygen and sulphur atoms and NH and 1-6C N-alkyl radicals; and the pharmaceutically-acceptable acid additions salts thereof. Pharmaceutical compositions and methods of manufacture are also described. The compound of the formula I is a histamine H-2 antagonist and is therefore useful in ulcer therapy. |
