Phytosphingosine is long-chain, complex fatty alcohol that functions as a water-binding agent and also has preservative qualities that has shown to be beneficial for the skin. It’s often listed as a skin conditioning ingredient.

Phytosphingosine (Wikipedia)

Phytosphingosine is a sphingoid base, a fundamental building block of more complex sphingolipids. It is abundant in plants and fungi and present in animals.

Phytosphingosine

Names
Preferred IUPAC name (2S,3S,4R)-2-Aminooctadecane-1,3,4-triol
Other names Hydroxysphinganine D-ribo-Phytosphingosine (4R)-Hydroxysphinganine
Identifiers
CAS Number	554-62-1
3D model (JSmol)	Interactive image
Beilstein Reference	1725301
ChEBI	CHEBI:46961
ChEMBL	ChEMBL236036
ChemSpider	108921
ECHA InfoCard	100.103.588
EC Number	439-210-6
KEGG	C12144
PubChem CID	122121
UNII	GIN46U9Q2Q
CompTox Dashboard (EPA)	DTXSID80203951
InChI InChI=1S/C18H39NO3/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-17(21)18(22)16(19)15-20/h16-18,20-22H,2-15,19H2,1H3/t16-,17+,18-/m0/s1 Key: AERBNCYCJBRYDG-KSZLIROESA-N
SMILES CCCCCCCCCCCCCC[C@H]([C@H]([C@H](CO)N)O)O
Properties
Chemical formula	C18H39NO3
Molar mass	317.514 g·mol−1
Melting point	102–103 °C (216–217 °F; 375–376 K)
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H318, H410 Preview warning: Omit Rules: keep H410, omit H400
Precautionary statements	P273, P280, P305+P351+P338, P310, P391, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references