a 1,3-diacyl-2-(9Z,12Z-octadecadienoyl)-glycerol + an N-(omega-hydroxy-ultra-long chain fatty acyl)-sphing-4-enine = an N-(omega-(9Z,12Z-octadecadienoyloxy)-ultra-long chain fatty acyl)-sphing-4-enine + a 1,3-diacylglycerol — reaction