Patent ID: 7455856

Claim:
A bisphosphonic acid of the general formula (I) wherein R 1 is H, OH, C 1 -C 6 alkyl C 1 -C 6 alkoxy, C 1 -C 6 hydroxyalkyl, C 1 -C 6 aminoalkyl, C 1 -C 6 halogen alkyl, X is a direct bond, alkylen group with 1 to 20 carbon atoms, (CH 2 ) m —(OCR 3 HCH 2 ) n —(O) o —, wherein R 3 is H or CH 3 and m is 0 or a number from 1 to 6, n is a number from 1 to 10, and o is 0 or 1, —(CR 4 HCH 2 O) p —, wherein R 4 is H or CH 3 , p is a number from 1 to 10, (CH 2 ) q —(OCR 5 HCH 2 ) r —(O) s —(CH 3 ) t —, wherein R 5 is H or CH 3 and q is 0 or a number from 1 to 6, r is a number from 1 to 10, and s is 0 or 1, and t is a number from 1 to 6, R 2 is a group of the formula (II) as well as its physiologically compatible salts and trimethyl silyl compounds.