2YWP:
reference: Synthesis and biological evaluation of 1-(2,4,5-trisubstituted phenyl)-3-(5-cyanopyrazin-2-yl)ureas as potent Chk1 kinase inhibitors., Li G, Hasvold LA, Tao ZF, Wang GT, Gwaltney SL 2nd, Patel J, Kovar P, Credo RB, Chen Z, Zhang H, Park C, Sham HL, Sowin T, Rosenberg SH, Lin NH, Bioorg Med Chem Lett. 2006 Apr 15;16(8):2293-8. Epub 2006 Jan 30. PMID: 16446090

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