The C18 Ceramide, with the CAS registry number 2304-81-6, has the systematic name of N-[(3E)-2-hydroxy-1-(hydroxymethyl)heptadec-3-en-1-yl]octadecanamide. It is also called N-[(1S,2R,3E)-2-hydroxy-1-(hydroxymethyl)-3-heptadecenyl]-octadecanamide. And the molecular formula of this chemical is C₃₆H₇₁NO₃. In addition, it is a kind of off white powder, and belongs to the following product categories: Mixed Fatty Acids; Activators; Fatty Acid Derivatives & Lipids; Glycerols; Protein Kinase Inhibitors and Activators. What's more, it should be stored at -20°C, and while dealing with it, you should avoid contact with skin and eyes.

The physical properties of C18 Ceramide are as following: (1)ACD/LogP: 14.40; (2)# of Rule of 5 Violations: 2; (3)ACD/LogD (pH 5.5): 14.4; (4)ACD/LogD (pH 7.4): 14.4; (5)ACD/BCF (pH 5.5): 1000000; (6)ACD/BCF (pH 7.4): 1000000; (7)ACD/KOC (pH 5.5): 10000000; (8)ACD/KOC (pH 7.4): 10000000; (9)#H bond acceptors: 4; (10)#H bond donors: 3; (11)#Freely Rotating Bonds: 34; (12)Polar Surface Area: 38.77 Å²; (13)Index of Refraction: 1.479; (14)Molar Refractivity: 175.5 cm³; (15)Molar Volume: 618 cm³; (16)Polarizability: 69.57×10^-24cm³; (17)Surface Tension: 35.8 dyne/cm; (18)Density: 0.915 g/cm³; (19)Flash Point: 373.8 °C; (20)Enthalpy of Vaporization: 116.32 kJ/mol; (21)Boiling Point: 694.5 °C at 760 mmHg; (22)Vapour Pressure: 2.59E-22 mmHg at 25°C.

You can still convert the following datas into molecular structure:
(1)SMILES: O=C(NC(CO)C(O)/C=C/CCCCCCCCCCCCC)CCCCCCCCCCCCCCCCC
(2)InChI: InChI=1/C36H71NO3/c1-3-5-7-9-11-13-15-17-18-20-22-24-26-28-30-32-36(40)37-34(33-38)35(39)31-29-27-25-23-21-19-16-14-12-10-8-6-4-2/h29,31,34-35,38-39H,3-28,30,32-33H2,1-2H3,(H,37,40)/b31-29+
(3)InChIKey: VODZWWMEJITOND-OWWNRXNEBB