has functional parent sphingomyelin d18:1/18:3 724.551926 724.552 A sphingomyelin d18:1 in which the total number of carbons in the fatty acyl group is 18 with 3 double bonds. C41H77N2O6P CHEBI:131458 N-octadecatrienoylsphingosine-1-phosphocholine SM d18:1/18:3 SM(d18:1/18:3) [C@@H]([C@@H](/C=C/CCCCCCCCCCCCC)O)(COP(OCC[N+](C)(C)C)(=O)[O-])NC(=O)* chebi_ontology sphingomyelin(d18:1/18:3) sphingomyelin d18:1 octadecatrienoic acid sphingomyelin 36:4