deoxypyridinoline deoxypyridinoline deoxypyridinoline, also called d-pyrilinks, pyrilinks-d, or deoxypyd, is one of two pyridinium cross-links that provide structural stiffness to type i collagen found in bones. it is excreted unmetabolized in urine and is a specific marker of bone resorption and osteoclastic activity. it is measured in urine tests and is used along with other bone markers such as alkaline phosphatase, osteocalcin, and n-terminal telopeptide to diagnose bone diseases such as postmenopausal osteoporosis, bone metastasis, and paget's disease, furthermore, it has been useful in monitoring treatments that contain bone-active agents such as estrogens and bisphosphonates. deoxypyridinoline names systematic iupac name (2r)-6-hexanoate identifiers cas number 83462-55-9 y chemspider 94801 pubchem cid 105071 unii gxi9wv7ip9 y comptox dashboard (epa) dtxsid701009105 properties chemical formula c18h28n4o7 molar mass 412.43752 g mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references certain studies have attempted to generate a standardization of deoxypyridinoline via an individual molar absorptivity value at acid and neutrality ph. the result was 5160 and 5290 l mol−1 cm−1 respectively.