olpadronic acid olpadronic acid olpadronic acid (inn; salt form olpadronate) is a bisphosphonate. it is used as part of a cancer symptom treatment support in cases of high blood calcium levels (hypercalcemia) and the reduction of fractures/pain that are the result of when cancer spreads to the bone (metastasis). olpadronic acidclinical dataatc codenoneidentifiers iupac name bis(phosphonic acid) cas number63132-39-8 ypubchem cid198716chemspider171999 nunii874hhb2v3scomptox dashboard (epa)dtxsid50212479 chemical and physical dataformulac5h15no7p2molar mass263.123 g·mol−13d model (jsmol)interactive image smiles cn(c)ccc(o)(p(=o)(o)o)p(=o)(o)o inchi inchi=1s/c5h15no7p2/c1-6(2)4-3-5(7,14(8,9)10)15(11,12)13/h7h,3-4h2,1-2h3,(h2,8,9,10)(h2,11,12,13) nkey:ugepsjnlorcrbo-uhfffaoysa-n n ny (what is this?) (verify)