3OT8:
reference: Discovery of pyrazolo[1,5-a]pyrimidine-based CHK1 inhibitors: A template-based approach-Part 1., Dwyer MP, Paruch K, Labroli M, Alvarez C, Keertikar KM, Poker C, Rossman R, Fischmann TO, Duca JS, Madison V, Parry D, Davis N, Seghezzi W, Wiswell D, Guzi TJ, Bioorg Med Chem Lett. 2010 Oct 27. PMID: 21094608

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