3N51:
reference: Discovery of Potent and Selective Inhibitors of Calcium-Dependent Protein Kinase 1 (CDPK1) from C. parvum and T. gondii., Murphy RC, Ojo KK, Larson ET, Castellanos-Gonzalez A, Perera BG, Keyloun KR, Kim JE, Bhandari JG, Muller NR, Verlinde CL, White AC, Merritt EA, Van Voorhis WC, Maly DJ, ACS Med Chem Lett. 2010 Oct 14;1(7):331-335. PMID: 21116453

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