SACLAC, a Ceramide analog, is a potent and covalent acid ceramidase (ASAH1; AC) inhibitor with a K i of 97.1 nM. SACLAC effectively blocks AC activity and induces a decrease in sphingosine 1-phosphate (S1P) and total ceramide levels. SACLAC reduces the levels of splicing factor SF3B1 and alternative Mcl-1 mRNA splicing, increases pro-apoptotic Mcl-1S levels to induce apoptosis in acute myeloid leukemia (AML) cells. SACLAC reduces the leukemic burden in human AML xenograft mouse models.