Human Dck C4S-S74E Mutant In Complex With Udp And The Inhibitor 10 {2-{[(1R/S)-1-{2-[3-(2-Fluoroethoxy)-4-Methoxyphenyl]-5-Methyl-1,3-Thiazol 4-Yl}Ethyl]Sulfanyl}Pyrimidine-4,6-Diamine}