Trypanosoma brucei methionyl-tRNA synthetase in complex with inhibitor N-[(4R)-6,8-dichloro-1,2,3,4-tetrahydroquinolin-4-yl]-N'-(5-fluoro-3H-imidazo[4,5-b]pyridin-2-yl)propane-1,3-diamine (Chem 1717)