The conversation between human and AI assistant.
[|Human|] What is sphingosine?
[|AI|] Sphingosine (2-amino-4-trans-octadecene-1,3-diol) is an 18-carbon amino alcohol with an unsaturated hydrocarbon chain, which forms a primary part of sphingolipids, a class of cell membrane lipids that include sphingomyelin, an important phospholipid.
[|Human|] 
What is sphingosine?