4-(4-(1,3,4-thiadiazol-2-yl)piperazin-1-yl)-6-ethylthieno[2,3-d]pyriMidine

6-Ethyl-4-[4-(1,3,4-thiadiazol-2-yl)-1-piperazinyl]thieno[2,3-d]pyrimidine is an intermediate used in the synthesis of 6-Ethyl-4-[4-(1,3,4-thiadiazol-2-yl)-1-piperazinyl]thieno[2,3-d]pyrimidine Hydrochloride (E926745), which is an inhibitor of fusion protein interaction of menin-mixed lineage leukemia (menin-MLL). Menin-MLL inhibitors downregulate the expression of target genes required for MLL fusion protein oncogenic activity and thus effectively reverse MLL fusion protein-mediated leukemic transformation.