has functional parent N-(heptadecenoyl)nonadecasphingosine-1-phosphocholine 728.583 729.067 A sphingomyelin 36:2 obtained by formal condensation of the carboxy group of any heptadecenoic acid with the amino group of nonadecasphingosine-1-phosphocholine. C(=C/CCCCCCCCCCCCCC)\[C@@H](O)[C@@H](NC(*)=O)COP(OCC[N+](C)(C)C)(=O)[O-] C41H81N2O6P CHEBI:136287 N-(heptadecenoyl)nonadecasphing-4-enine-1-phosphocholine SM(d19:1/17:1) chebi_ontology sphingomyelin d19:1/17:1 heptadecenoic acid sphingomyelin 36:2