4YCM:
reference: Biselyngbyasides, cytotoxic marine macrolides, are novel and potent inhibitors of the Ca(2+) pumps with a unique mode of binding., Morita M, Ogawa H, Ohno O, Yamori T, Suenaga K, Toyoshima C, FEBS Lett. 2015 Jun 4;589(13):1406-11. doi: 10.1016/j.febslet.2015.04.056. Epub, 2015 May 6. PMID: 25957767

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).