3R21:
reference: Design, synthesis, and biological evaluation of pyrazolopyrimidine-sulfonamides as potent multiple-mitotic kinase (MMK) inhibitors (part I)., Zhang L, Fan J, Chong JH, Cesena A, Tam BY, Gilson C, Boykin C, Wang D, Aivazian D, Marcotte D, Xiao G, Le Brazidec JY, Piao J, Lundgren K, Hong K, Vu K, Nguyen K, Gan LS, Silvian L, Ling L, Teng M, Reff M, Takeda N, Timple N, Wang Q, Morena R, Khan S, Zhao S, Li T, Lee WC, Taveras AG, Chao J, Bioorg Med Chem Lett. 2011 Jul 13. PMID: 21798738

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