General structure and examples of the two principal eCBome ligand families: N-acylamides and monoacylglycerols. Anandamide, AEA; 2-arachidonoylglycerol, 2-AG; oleoylethanolamide, OEA; 2-oleoylglycerol, 2-OG; palmitoylethanolamide, PEA; lysophosphatidylinositol, LPI.