1-octadecanoyl-2-(9Z,12Z)-octadecadienoyl-sn-glycero-3-phosphocholine + N-(acetyl)-sphing-4-enine => 1-(9Z,12Z-octadecadienoyl)-N-acetylsphing-4-enine + 1-octadecanoyl-sn-glycero-3-phosphocholine
1-octadecanoyl-2-(9z,12z)-octadecadienoyl-sn-glycero-3-phosphocholine + n-(acetyl)-sphing-4-enine => 1-(9z,12z-octadecadienoyl)-n-acetylsphing-4-enine + 1-octadecanoyl-sn-glycero-3-phosphocholine