4FHK:
reference: Discovery and optimization of potent and selective imidazopyridine and imidazopyridazine mTOR inhibitors., Peterson EA, Boezio AA, Andrews PS, Boezio CM, Bush TL, Cheng AC, Choquette D, Coats JR, Colletti AE, Copeland KW, Dupont M, Graceffa R, Grubinska B, Kim JL, Lewis RT, Liu J, Mullady EL, Potashman MH, Romero K, Shaffer PL, Stanton MK, Stellwagen JC, Teffera Y, Yi S, Cai T, La DS, Bioorg Med Chem Lett. 2012 Jun 16. PMID: 22765895

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