Pyrido[4,3- d ]pyrimidin-4(3 H )-one derivatives as calcium...

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

Reexamination Certificate

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C544S279000

Reexamination Certificate

active

07829572

ABSTRACT:
The present invention is directed to novel pyrido[4,3-d]pyrimidin-4(3H)-one derivatives and pharmaceutically acceptable salts thereof of structural formula Iwherein the variables R1, R2, R3, R4and R5are as described herein. Also provided are pharmaceutical compositions comprising the compounds of formula I as well as methods of treatment employing compounds of formula I to treat a disease or disorder characterized by abnormal bone or mineral homeostasis such as hypoparathyroidism, osteoporosis, osteopenia, periodontal disease, Paget's disease, bone fracture, osteoarthritis, rheumatoid arthritis, and humoral hypercalcemia of malignancy.

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