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N-Palmitoyl-D-sphingomyelin-d9 (Sphingomyelin 16:0-d9) is deuterium labeled N-Palmitoyl-D-sphingomyelin. N-Palmitoyl-D-sphingomyelin (Sphingomyelin 16:0) (Compound SM-03) can be used for the synthesis of lipid nanoparticles[1][2].

[1] Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019 Feb;53(2):211-216. DOI:10.1177/1060028018797110
[2] Dandan LING, et al. Lipid compounds and lipid nanoparticle compositions. Patent. WO2023056914.