3VAP:
reference: Synthesis and SAR studies of imidazo-[1,2-a]-pyrazine Aurora kinase inhibitors with improved off-target kinase selectivity., Voss ME, Rainka MP, Fleming M, Peterson LH, Belanger DB, Siddiqui MA, Hruza A, Voigt J, Gray K, Basso AD, Bioorg Med Chem Lett. 2012 Mar 21. PMID: 22503250

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