The histone methyltransferase DOT1L (DOT1 like, disruptor of telomeric silencing) is responsible for methylation of H3K79, leading to oncogene transcription, and it is involved in the development of different types of cancers such as MLL-rearranged leukemia (MLL-r, myeloid-lymphoid leukemia). Inhibitors of DOT1L have therapeutic potential. Thus, we present herein the