| abstract |
Novel heterocyclic bisphosphonic acid derivatives represented by the following general formula (I): <CHEM> in which @ @@ means one of following (A) and (B): <CHEM> wherein a dotted line in (A) means that two adjacent atoms are bonded by a single bond or a double bond, <CHEM> wherein R<6> and R<7> may be the same or different, each represents a hydrogen atom, a lower alkyl group, a halogen atoms or a hydroxyl group, R<1> represents a hydrogen atom or a hydroxyl group, R<2>,R<3>,R<4> and R<5> may be the same or different, each represents a hydrogen atom or a lower alkyl group, "n" is 0 or 1, provided that "n" is 1 when the ring @@@ means (A), and "R<1>" is a hydroxyl group when the ring @@@ means (B), pharmaceutically acceptable salts thereof and bone resorption inhibitors containing the compounds as active ingredient. |