– GSK 3186899 (GSK-3186899, DDD853651) is a novel specific inhibitor of parasite cdc-2-related kinase 12 (CRK12), shows activity against L. donovani in intra-macrophage assay with EC50 value of 1.4 uM, and shows good selectivity against mammalian THP-1 host cells (EC50> 50 uM).