preferred_name: an N-(omega-(9Z,12Z-octadecadienoyloxy)-ultra-long chain fatty acyl)-sphing-4-enine + a diacylglycerol => an N-(omega-hydroxy-ultra-long chain fatty acyl)-sphing-4-enine + a (9Z,12Z)-octadecadienoyl-containing triacyl-sn-glycerol