N-(tetracosenoyl)heptadecasphingosine-1-phosphocholine 798.661 799.200 A sphingomyelin 41:2 obtained by formal condensation of the carboxy group of any tetracosenoic acid with the amino group of hexadecasphingosine-1-phosphocholine. C(CCCCCCCCC)CC\C=C\[C@@H](O)[C@@H](NC(*)=O)COP(OCC[N+](C)(C)C)(=O)[O-] C46H91N2O6P CHEBI:136276 N-(tetracosenoyl)heptadecasphing-4-enine-1-phosphocholine SM(d17:1/24:1) chebi_ontology sphingomyelin d17:1/24:1 sphingomyelin 41:2