2-Methylene analogs of 1alpha-hydroxy-19-norvitamin D3: synthesis, biological activities and docking to the ligand binding domain of the rat vitamin D receptor.
Grzywacz P, Plum LA, Sicinska W, Sicinski RR, Prahl JM, DeLuca HF, J Steroid Biochem Mol Biol, 2004 May - link