Without designation, glycerophospholipids are shown in R stereochemistry at the C-2 carbon of glycerol, which corresponds to natural L-glycerol derivatives with the head group at the sn-3 position. In rare cases, of glycerophospholipids with S stereochemistry at C-2 and head group at the sn-1 position, stereochemistry is specified by appending [S] to the abbreviation. Unknown stereochemistry is indicated by [U].
For sphingolipids, D-erythro or 2S,3R configuration is implied for sphinganine and additionally 4E geometry for the double bond in sphingosine (sphing-4-enine).
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Liebisch, G. (2016). Implied Stereochemistries. In: Wenk, M. (eds) Encyclopedia of Lipidomics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7864-1_3-1
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DOI: https://doi.org/10.1007/978-94-007-7864-1_3-1
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