C24 dihydro 1-Deoxyceramide (m18:0/24:0) is a very long-chain atypical ceramide containing a 1-deoxysphinganine backbone. 1-Deoxysphingolipids are formed when serine palmitoyltransferase condenses palmitoyl-CoA with alanine instead of serine during sphingolipid synthesis.1,2 C24 dihydro 1-Deoxyceramide (m18:0/24:0) has been found in mouse embryonic fibroblasts (MEFs) following application of 1-deoxysphinganine alkyne or 1-deoxysphinganine-d3.3 It has also been found in mouse brain, spinal cord, and sciatic nerve at one, three, and six months of age.4