Diphosphonate compounds, processes for their preparation and pharmaceutical compositions containing them and being useful for treating calcium metabolism disorders. The diphosphonates are of the formula ##STR1## wherein R.sub.1 and R.sub.2 are hydrogen, acyl or alkyl which can be substituted by aryl, R.sub.3 and R.sub.4 are hydrogen or alkyl or R.sub.3 and R.sub.4 together represent lower alkylene, R.sub.5 is a hydrogen atom or alkyl, X is a valency bond or alkylene, Y is a valency bond, alkylene or substituted alkylene, Z is hydrogen, hydroxyl or amino group optionally substituted by alkyl and n is 1, 2 or 3; and including the pharmacologically acceptable salts thereof.
二膦酸盐化合物,其制备方法以及含有它们的药物组合物,用于治疗
钙代谢紊乱。这些
二膦酸盐的
化学式为##STR1##其中R.sub.1和R.sub.2为氢、酰基或烷基,可以被芳基取代,R.sub.3和R.sub.4为氢或烷基,或者R.sub.3和R.sub.4一起代表较低的烷基烯,R.sub.5为氢原子或烷基,X为价键或烷基,Y为价键、烷基或取代烷基,Z为氢、羟基或
氨基,可选地被烷基取代,n为1、2或3;包括其药理学上可接受的盐。