A bisphosphonic acid derivative of the general formula (I): ##STR1## wherein A is an optionally substituted cyclic group; R.sup.1 is hydrogen atom or a lower alkanoyl group; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and are hydrogen atom or a lower alkyl group; m is 0, 1 or 2; and n is an integer from 2 to 10, or a salt thereof is disclosed. A process for its production and a bone resorption inhibitor containing the compound of the general formula (I) or a salt thereof are also disclosed.
公式(I)的双
磷酸盐衍
生物为:##STR1## 其中A是可选取的取代环状基团;R.sup.1是氢原子或低烷酰基团;R.sup.2、R.sup.3、R.sup.4和R.sup.5相同或不同,是氢原子或低烷基团;m为0、1或2;n为2到10的整数,或其盐。公开了其生产过程以及含有公式(I)化合物或其盐的骨吸收
抑制剂。