1-[(11Z)-octadecenoyl]-2-[(5Z,8Z,11Z,14Z,17Z)-eicosapentaenoyl]-sn-glycero-3-phosphocholine is a phosphatidylcholine 38:6 in which the acyl groups specified at positions 1 and 2 are (11Z)-octadecenoyl and (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoyl respectively. It is functionally related to an all-cis-5,8,11,14,17-icosapentaenoic acid and a cis-vaccenic acid.