Phospholipids

They are the result of the linkage of a molecule of glycerol (glycerin) with 2 of fatty acid and one of phosphate, this linked in turn to a polar alcohol ("head group").

The example here shown is dilauroyl phosphatidyl ethanolamine
formed by:

• glycerol (CH₂OH-CHOH-CH₂OH)
• 2 molecules of lauric acid (12:0)
• a phosphate group (-O-PO₂-O-)
• ethanolamine (HO-CH₂-CH₂-NH₂)

the components.

It is interesting to the hydrophobic part from the hydrophilic part (this defines the lipid position within biological membranes).