@article{article,
title = {Synthesis of CD-ring modified 1-alpha,25-dihydroxy vitamin D analogues: Five-membered D-ring analogues},
author = {},
year = {1997},
journal = {Bioorganic and Medicinal Chemistry Letters},
volume = {7},
number = {7},
pages = {923-928},
howpublished = "\url{https://eurekamag.com/research/009/507/009507472.php}"
}