1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine + N-(acetyl)-sphing-4-enine = 1-(9Z-octadecenoyl)-N-(acetyl)-sphing-4-enine + (9Z-octadecenoyl)-sn-glycero-3-phosphocholine
1,2-di-(9z-octadecenoyl)-sn-glycero-3-phosphocholine + n-(acetyl)-sphing-4-enine = 1-(9z-octadecenoyl)-n-(acetyl)-sphing-4-enine + (9z-octadecenoyl)-sn-glycero-3-phosphocholine