Lipids are (tri)esters of glycerine (propane-1,2,3-triol)
Propane-1,2,3-triyl tri(octadecanoate)
This is the main constituent of animal fats
Propane-1,2,3-triyl tri(hexadecanoate)
This is the main constituent of vegetal fats
Propane-1,2,3-triyl tri(oct-8-endecanoate)
This is the main constituent of olive oil