Human Dck C4S-S74E Mutant In Complex With Udp And The Inhibitor 12R {N-{2-[5-(4-{(1R)-1-[(4,6-Diaminopyrimidin-2-Yl)Sulfanyl]Ethyl}-5-Methyl-1,3-Thiazol-2-Yl)-2-Methoxyphenoxy]Ethyl}Methanesulfonamide}