Illustrated Glossary of Organic Chemistry

Phosphatidyl choline: A phospholipid consisting of phosphatidic acid bonded to choline via a phosphate ester. Major components of cell membranes.

Molecular structure of phosphatidyl choline. R1 and R2 are fatty acid hydrocarbon chains. The phosphatidic acid moiety is shown in red, and the choline moiety in blue.