preferred_name: 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-(1'-sn-glycerol) + N-(acetyl)-sphing-4-enine = 2-(9Z-octadecenoyl)-sn-glycero-3-phospho-(1'-sn-glycerol) + 1-octadecanoyl-N-(acetyl)-sphing-4-enine