Patent ID: 7268124

Claim:
An unsymmetrical bisphosphonate compound of formula I: wherein: R 1 is a saturated or unsaturated (C 5 -C 20 )alkyl chain that optionally comprises one or more aryl rings in the chain and that is optionally substituted with one or more halo, trifluoromethyl, —OR a , —P(═O)(OR a ) 2 , or —NR b R c ; R 2 is a saturated or unsaturated (C 5 -C 20 )alkyl chain that optionally comprises one or more aryl rings in the chain and that is optionally substituted with one or more halo, trifluoromethyl, —OR a , P(═O)(OR a ) 2 , or —NR b R c ; each R 3 , R 4 , R 5 and R 6 is independently OH or (C 1 -C 6 )alkoxy; each R a is independently H, (C 1 -C 6 )alkyl, or aryl; and each R b and R c is independently H, (C 1 -C 6 )alkyl, or aryl; or R b and R c together with the nitrogen to which they are attached form a pyrrolidino, piperidino, morpholino, or thiomorpholino ring; wherein any aryl is optionally substituted with one or more (C 1 -C 6 )alkyl, (C 1 -C 6 )alkoxy, (C 1 -C 6 )alkanoyl, (C 1 -C 6 )alkanoyloxy, (C 1 -C 6 )alkoxycarbonyl, halo, cyano, nitro, carboxy, trifluoromethyl, trifluoromethoxy, NR d R e , or S(O) 2 NR d R e , wherein each R d and R e is independently H or (C 1 -C 6 )alkyl; and wherein R 1 is not equal to R 2 ; or a pharmaceutically acceptable salt or prodrug thereof.