preferred_name: 1-nonadecanoyl-sn-glycero-3-phosphocholine + 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine = 1-nonadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine + 1-octadecanoyl-sn-glycero-3-phosphocholine